In muscle contraction, calcium ions bind to the regulatory protein troponin, which is part of the thin filament of muscle fibers.
When a nerve impulse reaches a muscle fiber, it triggers the release of calcium ions from the sarcoplasmic reticulum (a specialized type of smooth endoplasmic reticulum) in the muscle cell. The calcium ions then bind to troponin, causing a conformational change in the protein complex that moves tropomyosin away from the myosin-binding sites on the actin filament.
This allows myosin heads to bind to actin and form cross-bridges, initiating the sliding of the actin and myosin filaments past each other, leading to muscle contraction. When the level of calcium ions in the cytosol decreases, troponin returns to its original conformational state, causing tropomyosin to block the myosin-binding sites and preventing further muscle contraction.
To know more about troponin, visit the link given below:
https://brainly.com/question/30506716
#SPJ4
_________ enzymes are stable in part because they contain relatively low amounts of the amino acid glycine.
a. Psychrophilic b. Acidophilic c. Thermophilicd. Halophilice. Barophilic
The answer is C - Thermophilic enzymes are stable in part because they contain relatively low amounts of the amino acid glycine. Thermophilic enzymes are able to survive and remain active at high temperatures due to the low amounts of glycine they contain, which gives them increased stability and allows them to remain functional.
Enzymes- Enzymes are protein-based substances produced by living organisms. The metabolism of living things requires enzymes to function correctly. Enzymes can speed up chemical reactions by reducing the activation energy of the reaction, enabling it to proceed at a much faster rate.
Amino acids- Amino acids are the building blocks of proteins. They are organic compounds that are both basic and acidic. There are 20 common amino acids that are found in proteins. They all have an amino group (-NH2) and a carboxyl group (-COOH) that combine to form an α-amino acid.
"enzymes", https://brainly.com/question/31134969
#SPJ11
what is the main function of dna helicase in dna replication?
DNA Helicase plays an important role in DNA replication by unwinding the double helix structure of DNA.
The main function of DNA Helicase is to unzip or break the hydrogen bonds between the complementary base pairs of DNA to form the replication fork. DNA replication takes place in three phases; initiation, elongation, and termination. In the initiation phase, DNA Helicase binds at the origin of replication and separates the strands of DNA to form a replication fork. In the elongation phase, DNA polymerase adds nucleotides to the newly synthesized DNA strand in a 5' to 3' direction, but in the opposite direction of the replication fork movement. Helicase facilitates the replication process by moving ahead of the replication fork, which enables the DNA strands to separate.In the termination phase, when the replication of DNA is complete, helicase along with other proteins releases the DNA strands from the replication fork. DNA Helicase is a critical enzyme in DNA replication and helps in the initiation, elongation, and termination of the process. DNA Helicase plays a significant role in maintaining the stability and continuity of genetic information in an organism.
To learn more about DNA ;
https://brainly.com/question/16099437
#SPJ11
Who are the 2 scientists that influenced Darwin's theory of evolution?
The two scientists that influenced Darwin's theory of evolution are Thomas Malthus and Charles Lyell.
Evolution is defined as the process of gradual development or changes of an organism's features over time as a result of changes in genetic and environmental factors. The theory of evolution, as proposed by Charles Darwin, is the most widely recognized scientific theory that explains how organisms change and adapt to their surroundings.The theory of evolution proposes that all species on Earth have evolved from a single common ancestor through a process of natural selection. According to Darwin's theory of evolution, organisms that possess favorable characteristics for their environment are more likely to survive and pass on those characteristics to their offspring. Those organisms that are less well-suited to their environment will not survive and their traits will eventually be lost over time.In the development of his theory, Darwin was influenced by the works of several scientists including Thomas Malthus and Charles Lyell. Darwin incorporated their ideas into his own to produce the theory of evolution. Malthus argued that human population growth was limited by food supply, and this idea provided Darwin with the concept of natural selection. Lyell's work in geology proposed that the Earth's surface has been shaped over a long period of time by gradual processes, and this helped Darwin to understand the concept of slow changes in species over time.Learn more about Darwin's theory of evolution: https://brainly.com/question/1589147
#SPJ11
What does it mean by Peptide bond?
Answer:
A covalent bond is produced by connecting the carboxyl group of one amino acid to the amino group of another while removing a molecule of water.
Explanation:
Brainliest, please!
___ happens when a bud is formed on the outside of a spongebuddingfragmentationregenerationmolting
When cell divide at a specific location to form a new organism from an outgrowth or bud, the process is known as asexual reproduction, or budding or blastogenesis.
As an illustration, the term "bud" refers to the tiny, bulbous protrusion that develops from the yeast cell. With the exception of mutations, asexual reproduction produces clone of the parent organism that are genetically identical to the original. In order to reproduce, creatures like hydras need regenerative cells during the budding process.
As a result of repeated cell division at one specific location, a bud develops as a protrusion. These buds develop into little individuals after they are fully matured, and these new, independent individuals eventually separate from the parent body.
Learn more about budding process here:
https://brainly.com/question/9913270
#SPJ4
in times of energy shortage due to inadequate carbohydrates or fats in foods, the body uses protein in what way?
The correct option is C, The body uses protein in removes the nitrogen portion and use the remaining fragments for energy.
A fragment generally refers to a piece of genetic material or an organism that has been broken off from a larger whole. In genetics, a fragment can refer to a segment of DNA that has been cut from a longer strand using a restriction enzyme or other molecular tools. These fragments can be used for a variety of purposes, such as analyzing genetic variation or constructing recombinant DNA molecules.
In ecology and conservation biology, a fragment can refer to a small, isolated piece of habitat that remains after a larger ecosystem has been altered or destroyed by human activity. These fragments can have significant impacts on biodiversity, as they may not provide enough resources or connectivity for species to survive and thrive.
To learn more about Fragments visit here:
brainly.com/question/14127090
#SPJ4
Complete Question:
In times of energy shortage due to inadequate carbohydrates or fats in foods, the body uses protein in what way?
A). decreases the breakdown of food proteins for energy and uses stored glycogen
B). stores amino acids in the cells to be used later for energy
C). removes the nitrogen portion and uses the remaining fragments for energy
D). converts it to fat to provide more concentrated energy
E). strips off its acid groups so that they can be used elsewhere for energy
Fun fact
Bananas are curved because they grow towards the sun ☀️
Answer:
True
Explanation:
It's because of the sun! Bananas are curved so they can retrieve sunlight. Bananas go through a process called 'negative geotropism'.
Hope it helped! :)
eliminating invasive plants and replacing them with native plants is one aspect of
Eliminating invasive plants and replacing them with native plants is one aspect of urban management.
When a forest is cut down or destroyed, the best reforestation practices call for immediate planting. According to regulations issued by governments in numerous nations, companies that cut down trees are required to reestablish the equilibrium by planting new trees after logging.
Animals and plants from other parts of the world that don't belong in their new environment are known as invasive species. Ship ballast water, accidental release, and most frequently, people can all introduce them to an area.
The rapid expansion of cities and towns, also known as urban sprawl or suburban sprawl, is often characterized by low-density residential housing, single-use zoning, and an increased reliance on the private automobile for transportation.
To learn more about urban management here
https://brainly.com/question/29565652
#SPJ4
select all of the molecules that are reactants of glycolysis.glucoseNAD+ ATP ADP
The reactants of glycolysis are glucose, NAD⁺, ATP. Option A, B, and C is correct.
Glycolysis is the metabolic pathway which converts glucose into pyruvate. It is an important process in cellular respiration, which is the process by which cells generate energy from glucose and other nutrients. Glycolysis takes place in the cytoplasm of cells and consists of a series of 10 chemical reactions, which can be grouped into two stages: the energy investment phase and the energy payoff phase.
During the energy investment phase, two ATP molecules are used to phosphorylate glucose, which makes it easier to break down in the subsequent steps. The glucose molecule is then split into two three-carbon molecules called glyceraldehyde 3-phosphate (G₃P).
In the energy payoff phase, the G₃P molecules are converted into pyruvate through a series of reactions that generate four ATP molecules and two NADH molecules. The ATP molecules are produced through a process called substrate-level phosphorylation, in which a phosphate group is transferred from a molecule to ADP, forming ATP. The NADH molecules are produced by the transfer of electrons from G₃P to NAD⁺.
Hence, A.B.C. glucose, NAD⁺, ATP is the correct option.
To know more about glycolysis here
https://brainly.com/question/27178607
#SPJ4
--The given question is incomplete, the complete question is
"Select all of the molecules that are reactants of glycolysis. A) glucose B) NAD⁺ C) ATP D) ADP."--
Which of the following can be destructive to Earth's surface?
Question:
Which of the following can be destructive to Earth's surface?
Answer:
rainstorm??
Please Help ASAP
What do evolutionary psychologists do, and how do they use natural selection, mutations, and adaptation to explain behavior tendencies in humans?
The goal of evolutionary psychology is to comprehend how natural selection has created human characteristics and behavioural inclinations.
According to the theory of natural selection, changes that improve an organism's chances of procreating and surviving are most likely to be handed down to succeeding generations.
According to the principle of natural selection, changes that boost a species' likelihood of reproducing and surviving are most likely to be handed on to succeeding generations.
Some changes result from mutations, including mistakes in gene recombination, while others are the result of novel gene combinations created during pregnancy. Long before it was commonplace, Darwin's theory of evolution predicted how evolutionary principles would be used to explain human psychology and animal behavior's.
To know more about evolutionary psychology click here:
https://brainly.com/question/30019175
#SPJ4
The peritoneal fold situated as a "fatty apron" anterior to the small intestine is the _____.A) mesenteryB) falciform ligamentC) lesser omentumD) greater omentum
The peritoneal fold situated as a "fatty apron" anterior to the small intestine is the lesser omentum therefore the correct option is C.
The lesser omentum is a double- layered pack of peritoneum that extends from the stomach to the transverse colon. It's composed of a connective towel layer and an external adipose layer. The lesser omentum functions to store fat, give protection for the organs of the tummy, and act as an immunological barrier.
It's also involved in the immersion of certain substances from the bowel, and helps to maintain a constant temperature in the abdominal depression. It's innervated by the vagus whim-whams and contains the large vessels of the abdominal depression.
Hence the correct option is C.
To know more about peritoneal fold visit:
https://brainly.com/question/28319533
#SPJ4
which portuguese red variety are the french considering for addition to approved varieties in bordeaux?Cabernet SauvignonCabernet FrancMerlotMalbecCarmenerePetit Verdot
Cabernet Sauvignon, Merlot, and Cabernet Franc make up the majority of a red Bordeaux blend, with smaller amounts of Malbec, Petit Verdot, and occasionally Carménère.
Merlot and Cabernet Sauvignon account for more than 90% of Bordeaux wines. You will learn about Bordeaux wine in this article, including tasting notes, food pairing suggestions, and important information. Bordeaux is where the first vines for Merlot and Cabernet Sauvignon were planted.
Recall that Bordeaux currently allows eight white grape varieties, including Semillon, Sauvignon Blanc, Sauvignon Gris, Muscadelle, Colombard, Ugni Blanc, Merlot Blanc, and Mauzac, in addition to six red grape varieties, including Cabernet Sauvignon, Cabernet Franc, Merlot, Malbec, Carmenere, and Petit Verdot.
To learn more about Merlot here
https://brainly.com/question/14162098
#SPJ4
A student wants to investigate osmosis. A carrot was placed in a dilute solution.
a) What will happen to its mass?
b) The carrot was placed in 0.4 mol/dm 3 solution. Its mass did not change.
c) What does this tell us about the concentration of the carrot?
d) The carrot was placed in a concentrated solution. What will happen to its mass?
a) When a carrot is submerged in a diluted solution, water will osmosis into the carrot cells. As a result, the cells will become turgid and the carrot's mass will rise.
b) The carrot's inability to alter in mass when submerged in a 0.4 mol/dm3 solution shows that the solute concentration—which includes salts and sugars—within the carrot cells is also 0.4 mol/dm3. There is no net movement of water into or out of the cells at this concentration.
c) This indicates that the carrot and the 0.4 mol/dm3 solution have come to an equilibrium. At this concentration, the passage of water into and out of the cells is balanced, and there is no net gain or loss of water.
d) If the carrot is submerged in a concentrated solution, water will osmotically escape from the cells, plasmolyzing them. The mass of the carrot will shrink as a result.
OsmosisOsmosis is the transfer of water molecules from a region with a high concentration of water to a region with a low concentration of water through a membrane that is selectively permeable. Since a diluted solution contains more water molecules than carrot cells do, water will osmotically flow from the fluid into the cells. The carrot cells become turgid, which is another word for inflated and hard, as a result of this water inflow. The carrot's mass so grows as a result.The carrot's inertness in a 0.4 mol/dm3 solution shows that the solute concentration inside the cells of the carrot is also 0.4 mol/dm3. At this concentration, there is no net gain or loss of water since the flow of water into and out of the cells is balanced. This is due to the fact that the solute concentration in the carrot cells and the solution are the same. Isotonic describes this condition.learn more about osmosis here
https://brainly.com/question/2625460
#SPJ1
Why is fermentation a required pathway for providing cellular energy when oxygen is unavailable or in insufficient supply? NAD is not regenerated by the electron transport chain. ATP production requires oxygen. NADH cannot be reduced to NAD Cells need either lactic acid or ethanol when oxygen is low, Lactic acid or ethanol can be used to generate oxygen.
Fermentation is a crucial pathway for providing cellular energy when oxygen is unavailable or in insufficient supply, as it allows cells to continue generating ATP by regenerating NAD+ and allowing glycolysis to continue.
Because it enables the regeneration of the oxidized form of the electron transport molecule NAD+, which is necessary for glycolysis to proceed, fermentation is a necessary mechanism for supplying cellular energy when oxygen is missing or in inadequate supply. Pyruvate is produced from glucose during glycolysis, and NAD+ is reduced to NADH. The electron transport chain's ability to convert NADH back into NAD+ in the presence of oxygen permits glycolysis to continue creating ATP. The electron transport chain, on the other hand, is unable to work when oxygen is lacking or insufficiently present, and NADH builds up, which can inhibit glycolysis.
By oxidizing NADH back to NAD during fermentation, NAD+ can be replenished, allowing glycolysis to continue generating ATP. Certain cells, like muscle cells and some microbes, can employ fermentation to make lactic acid or ethanol as end products in the absence of oxygen, allowing them to generate ATP without the need for oxygen.
To know more about Fermentation
brainly.com/question/13050729
#SPJ4
how is the natural system helpful to the world and others?
Answer: Natural systems provide for our fundamental survival needs. This may seem self-evident, yet it is alarming to realize that younger generations are growing up in homes that are farther away from their sources of concern, a source we schould all be worried about somtime in our life.
Explanation:
If the stock contains 48 chromosomes and the scion contains 30 chromosomes , then how many chromosomes are present in the root and egg cell of the resultant plant , respectively ?A)48 and 15B)15 and 48C)30 and 24D)24 and 15
48 chromosomes for the root cell and 15 chromosomes for the egg cell. Option A is correct.
When a stock plant and a scion plant are grafted together, the cells of the stock and scion remain separate but function as a single organism. The root and shoot system of the resulting plant is derived from the stock, while the scion contributes to the leaves, flowers, and fruit of the plant.
Since the stock has 48 chromosomes and the scion has 30 chromosomes, the resulting plant will have cells with a total of 78 chromosomes (48 + 30).
The egg cell of the plant will have half of the total chromosomes, which is 39 chromosomes (78/2).
The root cells of the plant will have the same number of chromosomes as the stock plant, which is 48 chromosomes.
Hence, A. 48 and 15 is the correct option.
To know more about root cell here
https://brainly.com/question/25464522
#SPJ4
Which of the following carpals articulates with the radius?
a. Triquetrum
b. Scaphoid
c. Pisiform
d. Hamate
The carpal bone that articulates with the radius is the Scaphoid. Therefore, the correct option is b. Scaphoid.
What is a Scaphoid ?The scaphoid is one of the eight carpal bones located in the wrist. It is also known as the navicular bone or the os scaphoideum. The scaphoid bone is located on the thumb side of the wrist, just below the base of the thumb. It is an important bone for the proper functioning of the wrist joint, as it helps to transfer loads from the hand to the forearm.
The scaphoid bone is shaped like a boat or a crescent moon, with a concave surface facing downward. It articulates with four other carpal bones: the trapezium, trapezoid, capitate, and lunate. The scaphoid also articulates with the radius bone of the forearm, which is important for wrist movement.
Injuries to the scaphoid bone are relatively common, particularly in athletes and individuals who engage in manual labor. Fractures or dislocations of the scaphoid bone can cause pain, swelling, and decreased wrist mobility. Treatment may include immobilization, physical therapy, or in some cases, surgery.
To know more about scaphoid visit :
https://brainly.com/question/7961772
#SPJ1
what steps are hypothesized in the derivation of the land plant life cycle (alternation of generations) from the charophycean green algae life cycle?
The steps hypothesized in the derivation of the land plant life cycle (alternation of generations) from the charophycean green algae life cycle is starting from the emberyophyte which evolves and adapts by developing body parts for both eating and reproduction until the sporophyte produces spores
Embryophytes (land plants) evolved from the charophycean green algae. Changes in the water content of the environment forced the plants to adapt. During this period of adaptation, land plants developed a cuticle and stomata, which helped them retain moisture. Plants also evolved specialized tissues to conduct water and nutrients from one part of the plant to another. Asexual reproduction in charophycean algae became sexual reproduction in land plants.
During sexual reproduction, land plants alternate between two generations: the haploid gametophyte and the diploid sporophyte. The gametophyte produces gametes through mitosis.8. Two gametes unite to form a diploid zygote that grows into a sporophyte. The sporophyte produces haploid spores through meiosis. Spores grow into gametophytes and the cycle begins a new.
Learn more about green algae at:
https://brainly.com/question/29824313
#SPJ11
Researchers have identified a series of speciation events that have created a new group of organisms. Which of the following terms best describes what has occurred?
A) Macroevolution
B) Biogeography
C) Microevolution
D) Geologic time scale
The term that best describes what occurred when researchers identified a series of speciation events that have created a new group of organisms is Macroevolution. So option A is the correct answer.
Macroevolution refers to the major evolutionary developments that have taken place over long periods of time. Macroevolution is the process by which an organism evolves over a long period of time, leading to the development of new species, classes, and phyla. The study of macroevolution focuses on the big picture, such as the origins of new groups, as well as the relationships between groups that emerged over millions of years. The term macroevolution is used in opposition to microevolution, which refers to small changes in the gene pool of a population over a brief period of time.
Learn more about macroevolution: https://brainly.com/question/1686357
#SPJ11
Which of the following molecules is the lowest-energy donor of electrons to the electron transport chain?
A. NADH
B. water
C. FADH2
D. ATP
The molecule that is the lowest-energy donor of electrons to the electron transport chain is FADH2.
What is the electron transport chain? The electron transport chain (ETC) is a sequence of electron carriers in the inner mitochondrial membrane that facilitate the generation of ATP via oxidative phosphorylation. The final electron acceptor in the electron transport chain is oxygen.
NADH and FADH2 are important electron donors to the electron transport chain. They donate electrons to complex I (NADH) and complex II (FADH2), respectively, which then transfer them through the electron transport chain to complex IV, where oxygen is the final electron acceptor.
The energy produced by electron transfer is used to pump protons across the inner mitochondrial membrane, forming a proton gradient that drives ATP synthesis via ATP synthase. Therefore, NADH and FADH2 are important contributors to ATP synthesis via oxidative phosphorylation.
What is FADH2? FADH2 is a type of reduced flavin adenine dinucleotide (FAD), a cofactor involved in redox reactions in cells. FADH2 is created when FAD accepts two electrons and two protons. FADH2 is a substrate for succinate dehydrogenase (complex II) in the electron transport chain, where it donates electrons to the chain via its flavin group.
Since the reduction potential of FADH2 is lower than that of NADH, fewer protons are pumped across the mitochondrial membrane when FADH2 donates electrons to the chain. Therefore, NADH donates more energy to the electron transport chain than FADH2 does.
To know more about FADH2, refer here:
https://brainly.com/question/30420322#
#SPJ11
Some behaviors such as mating and caring for young are genetically
determined in certain species of birds. The presence of these behaviors is
most likely due to the fact that
A) birds do not have the ability to learn
B) individual birds need to learn to survive and reproduce
C) these behaviors helped birds to survive in the past
D) within their lifetimes, birds developed these behaviors
The behaviors such as mating and caring for young are genetically determined in certain species of birds. The presence of these behaviors is most likely due to the fact that these behaviors helped birds to survive in the past.
The correct option is C)
Certain behaviors such as mating and caring for young are genetically determined in certain species of birds. The presence of these behaviors is most likely due to the fact that these behaviors helped birds to survive in the past. Over time, many bird species have developed and passed on behaviors that aid in their survival and reproduction. These innate behaviors enable birds to adapt and respond to their environment with efficiency and precision. Birds that display these behaviors, such as mating and caring for young, are more likely to produce offspring, ensuring the survival of their species. The genetic predisposition for these behaviors is thus passed down to future generations, perpetuating the cycle of survival and reproduction.
For more such questions on Birds, click on:
https://brainly.com/question/30028464
#SPJ11
Which of the following is the best example of an adaptation that improves an organism's "fitness"?
A. Dark-colored lizards living on light rocks.
B. A thick coat of fur on animals living in the hot desert.
C. Lizards with sticky toe pads live among tall trees.
Answer:
C. Lizards with sticky toe pads live among tall trees. is the best example of an adaptation that improves an organism's "fitness". The adaptation allows the lizards to climb and live in their arboreal habitat, increasing their chances of survival by avoiding predators and accessing resources.
where in the cell does the electron transport chain that is part of the fourth stage of aerobic respiration take place?
The electron transport chain that is part of the fourth stage of aerobic respiration occurs in the mitochondria of eukaryotic cells. It takes place in the inner membrane of the mitochondria, where the electron transport chain is located.
The electron transport chain consists of a series of protein complexes and molecules that move electrons from one complex to another. The electrons come from NADH and FADH2, which are produced in the previous stages of aerobic respiration. As the electrons move through the electron transport chain, they release energy that is used to pump protons across the inner membrane of the mitochondria. This creates a proton gradient that is used to generate ATP through chemiosmosis. Ultimately, the electrons combine with oxygen to form water, which is the final product of aerobic respiration. The electron transport chain is a critical step in aerobic respiration because it is responsible for generating the majority of the ATP that is produced during this process.
To learn more about Aerobic respiration ;
https://brainly.com/question/11691469
#SPJ11
Reptiles do not have the ability to create their own heat, and instead, sit in the sun for long periods of time in the mornings to warm up. Mammals and birds, on the other hand, have the ability to create their own heat. Where do mammals and birds get the energy for this heat?answer choiceso from oxygen they breath ino from sunlight the animals absorbo from body fat that keeps all heat trapped in the bodyo from food the animals eat
Reptiles do not generate their own heat and rely on basking in the sun in order to warm up.
Mammals and birds, however, have the ability to create their own heat. The energy to generate this heat comes from food they eat. Mammals and birds obtain energy from the breakdown of carbohydrates, proteins, and fats in the food they consume. This energy is then used by the body to create heat through metabolic processes such as respiration and digestion. This process helps to maintain the body temperature of these animals, even in cold environments. Heat can also be generated by burning stored body fat which helps to keep the body warm in colder environments. So, the energy that mammals and birds use to generate their own heat comes from the food they eat and the stored body fat.
For more such questions on Reptiles
https://brainly.com/question/21358396
#SPJ11
what is the low density tissue at the end of bones
Answer:
The low-density tissue at the end of bones is called the spongy bone or cancellous bone. Unlike the compact bone that makes up the outer layer of bones, spongy bone has a porous and honeycomb-like structure with many spaces filled with bone marrow.
Spongy bone is found at the ends of long bones, such as the femur and the humerus, as well as in other bones, including the vertebrae and the pelvis. It provides structural support to the bone while also allowing for flexibility and shock absorption.
Spongy bone also plays an important role in bone metabolism as it contains red bone marrow, which produces red blood cells, white blood cells, and platelets. It also contains stem cells that can differentiate into osteoblasts, the cells responsible for bone formation, helping to maintain bone health and repair damaged bone tissue.
What stage of production are the cattle kept in large pastures? a. Cow/Calf Production b.Backgrounding C.Feedlot d.Both A & B
a. Cow/Calf Production stage of production are the cattle kept in large pastures
What does "backing cattle on pasture" mean?Growing steers and heifers from weaning until they enter the feedlot for finishing is known as backgrounding. It is appropriate for farmers who do not want to finish cattle or keep a cow herd but still want to add weight to calves after weaning.
the part of the cow-calf industry that generates feeder calves for further feeding or grazing. Recently weaned calves gain body weight during the backgrounding or stocker phase of production, culminating in yearlings that are prepared for feedlots. Cattle are fed during the final phase of production until they achieve market weight.
learn more about cow-calf industry
https://brainly.com/question/30447199
#SPJ1
In the context of conservation biology, what does genetic diversity mean? a. The total number of species in a given region. b. Number and relative frequency of alleles in a population, species, or lineage. c. A quantity summarzing the average genetic difference between two randomly chosen individuals in a population. d. The number and relative frequency of species in a given region.
In the context of conservation biology, genetic diversity refers to the number and relative frequency of alleles in a population, species, or lineage. So, option B is correct.
The variety in genetic material within and between populations of a species is reflected by genetic diversity, which is a crucial component of biodiversity. Populations with genetic diversity can adapt to shifting environmental conditions, fend off disease, and avoid the detrimental consequences of inbreeding, genetic drift, and other factors that can make populations less fit. For species and ecosystems to survive over the long term, genetic diversity must be preserved.
Option (b) correctly defines genetic diversity as the number and relative frequency of alleles in a population, species, or lineage, while the other options are incorrect.
To know more about genetic diversity
brainly.com/question/14696671
#SPJ4
What happens when stimulus exceeds the threshold potential?
When stimulus exceeds the threshold potential, it causes an action potential to occur. An action potential is a rapid electrical signal that travels along the axon of a neuron.
It is triggered by a rapid change in the membrane potential, which occurs when stimulus exceeds the threshold potential. The action potential results in the release of neurotransmitters which can then cause an effect in another neuron. A stimulus is something that triggers a response in an organism or a cell. A stimulus could be a change in temperature, pressure, or sound, as well as a chemical substance such as hormones, neurotransmitters, or light energy.
When a stimulus exceeds the threshold potential, an action potential is triggered. The sodium channels in the neuron membrane open when an action potential is triggered, allowing the influx of sodium ions into the cell. As more and more positively charged sodium ions enter the cell, the inside of the neuron membrane becomes more positively charged, depolarizing it. As the inside of the neuron membrane becomes more positively charged than the outside, the potassium channels open, allowing the outflow of positively charged potassium ions from the cell. This outflow of potassium ions helps to restore the negative membrane potential, repolarizing the neuron membrane.
The action potential propagates along the length of the neuron's axon, causing the release of neurotransmitters from the axon terminal when it reaches the synapse. The neurotransmitters bind to receptor proteins on the surface of the receiving neuron, generating a new electrical signal that continues the process of information transfer.
To know more about Neuron please visit :
https://brainly.com/question/21225122
#SPJ11
What technology helped to support Hutton and Lyell’s hypothesis that Earth is much older than many people thought?
Radiometric dating and stratigraphy were two important technologies that helped to support Hutton and Lyell's hypothesis that the Earth is much older than previously believed.
Radiometric dating techniques allowed scientists to accurately determine the age of rocks and fossils by measuring the decay of radioactive isotopes. This helped to confirm the geological time scale developed by Hutton and Lyell, which showed that the Earth had undergone many changes over a long period of time. Stratigraphy, the study of rock layers and their relationships to each other, helped to construct a timeline of geological events and determine the relative ages of different rock formations.
To know more about radiometric click here:
brainly.com/question/14799339
#SPJ4
