An appropriate description mentioned in last statement, which is "It has half the amount of DNA as the cell that began meiosis".
How much DNA is present at the beginning of meiosis?A chromosome has a tetrad (4 chromatids or 4 DNA molecules) during prophase I and metaphase I of meiosis, which is then reduced to two chromatids (2 DNA molecules) by the time metaphase II takes place.Prophase I marks the start of meiosis I, the first meiotic division. Chromosomes are formed during prophase I during the condensing of the DNA and protein complex known as chromatin. The sister chromatids pairs of replicated chromosomes remain connected at a central region called the centromere.Learn more about meiosis here: brainly.com/question/29383386
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What does the following word equation represent?
Glucose + Oxygen Carbon Dioxide + Water + Energy
Select one:
O regeneration
O photosynthesis
O transpiration
O respiration
When glucose and oxygen are combined, carbon dioxide, water, & energy are produced.This process of converting glucose into energy in mammals is similar to how photosynthesis works in plants.
Which order does the energy flow for photosynthesis follow?Electrons go from glucose to oxygen during cellular respiration, creating water and release of energy.They move in the reverse way during photosynthesis, beginning with water and ending with glucose, which is an energy-intensive process driven by light.
Do water and carbon dioxide and glucose have greater energy?Photosynthesis requires an energy input because the products of photosynthesis, glucose and oxygen, have higher energy contents than the reactants, carbon dioxide and water.
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the sahara desert and the negev desert belong to the same ______ . group of answer choices a. community b. savanna ecosystem c. biome d. temperate grassland
The Sahara and Negev deserts are both parts of the same ecosystem(biome).
Latitude has no effect on an ecosystem, but it does on a biome. All creatures participate in trophic interactions within food webs and chains in an ecosystem, however this is not always the case in a biome. Aquatic, grassland, forest, desert, and tundra biomes are the five main kinds, while some of these can be further broken down into more specialized groups, such as freshwater, marine, savanna, tropical rainforest, moderate rainforest, & taiga. Scientists may define a biome by defining the temperature range, soil type, quantity of light, and water that are peculiar to a location and create niches for particular species.
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Which of the following is NOT a
negative ecological (ecosystem-
related) impact on rangelands
from grazing livestock?
A. the weight of the cattle compacts the soil
B. increased wind and water erosion
C. the livestock eat too much grass
D. the livestock waste fertilizes the grasses
Brain biopsy findings link major depressive disorder to neuroinflammation, oxidative stress, and neurovascular dysfunction: a case report
neuroinflammation, oxidative stress, and neurovascular dysfunction in depressive disorder Although the underlying mechanisms are not fully understood, nicotine addiction is typically seen in people with mental disorders.
The term "neuroinflammation" describes an inflammatory reaction that occurs in the brain or spinal cord. This inflammation is mediated by secondary messengers, reactive oxygen species, cytokines, and chemokines. Neuroinflammation: What causes it?
illustration of neuroinflammation
Neuroinflammation is the process by which the innate immune system of the brain is triggered in response to an inflammatory challenge, such as those provided by injury, infection, exposure to a toxin, neurodegenerative disease, or aging.
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in the general population, 1 in 300 individuals is a carrier for tay-sachs disease, while 1 in 30 individuals of ashkenazi jew descent are carriers. tay-sachs also affects 1 in 30 individuals with french-canadian ancestry, although two completely unique mutations are responsible for the ashkenazi and french-canadian mutations. Part A What are the chances of two individuals having a child with Tay-Sachs if both individuals are not of Ashkenazi or Franch-Canadian descent? Enter your answer using scientific notation. For the multiplication symbol, uso an asterisk 画? .366 10 2 Submit Incorrect; Try Again; 5 attempts remaining Part B what are the chances of two Individuals having a ¢hild with Tay-Sachs lf one Individual Is of Ashkenazi descent and one l$ no Submit My Answars Give Up Part C What are the chances of two individuals having a child with Tay-Sachs if both individuais are of Ashkenazi descent?
Answer: cheeks
Explanation:
balls
4.3.10. Network Address Translation (NAT). Which one of the following operations is NOT performed by NAT.? Select one: a. On an incoming datagram from the public Internet side of a NAT, changing the destination IP address of a datagram to a new destination IP address that is looked up in the NAT table, and (possibly after other actions), sending that IP datagram on to the LAN side of the NAT. Ob. On an outgoing datagram, changing the source IP address of a datagram received from the LAN side of the NAT O c Generating ACKs back to the TCP sender and then taking responsibility for reliably delivery the segment to its destination, possibly using a non-TCP reliable data transfer protocol. O d. On an outgoing datagram, changing the transport-layer port number of the transport-layer segment inside a datagram received from the LAN side of the NAT.
a. On an incoming datagram from the public Internet side of a NAT, changing the destination IP address of a datagram to a new destination sending that IP datagram on to the LAN side of the NAT.
NAT or network address translation is a network protocol is used by private networks to access the internet by assigning or mapping a public IP address to the private addresses.
The host with IP address 10.0.1.19 searches for the actual destination IP address 128.119.160.183 in its private network and when it does not find it, it sends the packet to the default gateway IP address 10.0.1.25, which is where the private IP address is NATted and sent to the destination.
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the process of respiration in root cells can make cations in the soil available for absorption into a root. t/f
It is true to say that the process of respiration in root cells can make cations in the soil available for absorption into a root.
Roots, the underground piece of the plants, ingests air from the air holes spaces tracked down between the dirt particles. Thus, assimilated oxygen through attaches is used to free the energy that later on, is utilized to move salts and minerals from the dirt.
We realize that plants have capacity to blend their own food via photosynthesis process. Photosynthesis happens in those pieces of the plants which contains chlorophyll, the green plant parts. Photosynthesis is obvious to the point that on occasion it appears to cover the respiratory cycle in plants. Breath should not be confused with photosynthesis. Breath happens all as the day progressed, yet the photosynthesis cycle happens in the daytime, within the sight of daylight as it were. Therefore, breath becomes clear at evening time in plants.
This is the explanation we frequently hear individuals caution against dozing under a tree during evening time, as it might prompt suffocation because of overabundance measures of carbon dioxide freed by trees following breath.
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ells require a constant exchange of solutes (ions and small molecules) with the outside of the cell. Many of these solutes undergo passive transport across the membrane. Passive transport occurs without the input of cellular energy. Some solutes are transported into the cell while others are transported out of the cell.Part A - Diffusion All molecules have energy that causes thermal motion. One result of thermal motion is diffusion: the tendency of substances to spread out evenly in the available space. Although the motion of each individual molecule is random, there can be directional motion of an entire population of molecules. Consider a chamber containing two different types of dye molecules, purple and orange. The chamber is divided into two compartments (A and B) by a membrane that is permeable to both types of dye. Initially (left image), the concentration of the orange dye is greater on side A, and the concentration of the purple dye is greater on side B. With time, the dye molecules diffuse to a final, equilibrium state (right image) where they are evenly distributed throughout the chamber. A membrane permeable to both dyes initial condition final condition (equilibrium) Adapted from Biology by Campbell and Reece © 2008 Pearson Education, Inc.
I gave a generic response to this query to emphasize the crucial details that would allow me to draw a conclusion about passive transport.
The movement of particles down their gradient is known as diffusion. Moving down a gradient simply indicates that the particle is attempting to be uniformly distributed throughout, much like dropping food coloring into the water. A gradient is any imbalance in concentration. When we produced our granola, a number of different components came together and dispersed throughout the entire concoction. It doesn't take any energy to move "downhill" during an evening out. Given its ease of passage through cell membranes, water is the chemical most likely to be involved in simple diffusion. Osmosis is the process of water simply diffusing through a medium.
Simple diffusion is essentially what it sounds like: molecules migrate through the membrane according to their gradients. Simple diffusion requires nonpolar* molecules that are tiny enough to fit through the membrane. If the diffusion distance is increased, simple diffusion may become interrupted. The amount of fluid that accumulates in our lungs' alveoli (pulmonary edema) increases the distance that the gases must travel, which reduces their conveyance.
For example, one such transporter channel, GLUT4, is incredibly important in diabetes. Diffusion that is assisted (facilitated) by a membrane transport channel is referred to as facilitated diffusion. These pathways, which are composed of glycoproteins (proteins with linked carbohydrates), allow substances to flow across the membrane. These channels are nearly typically unique to either a specific molecule or a certain class of molecule (such as an ion channel), and as a result, they are closely associated with specific physiological processes. A glucose transporter called GLUT4 is present in skeletal muscle and fat.
Hence, passive transport takes along concentration without energy expenditure.
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FILL IN THE BLANK. Conversely, if the muscle fiber is overly stretched, there is not enough overlap between the thick and ____________ myofilaments.
Conversely, if the muscle fiber is overly stretched, there is not enough overlap between the thick and thin myofilaments.
During muscle contraction, the thick and thin filaments slide over each other, and the myosin head on the thick filament pulls on the thin filament. This sliding motion creates the force of muscle contraction.
Muscle fibers contain two types of protein filaments called myofilaments.
Thick filaments made of the protein myosin and thin filaments made of the protein actin. These filaments are arranged in a repeating pattern within the muscle fiber, with thick and thin filaments overlapping at specific points.
If the muscle fibers are overstretched, there may not be enough overlap between the thick and thin filaments to effectively perform the gliding motion. This can lead to weaker muscle contractions. Conversely, if muscle fibers are not sufficiently stretched, the overlap between filaments can become too great, resulting in weak muscle contraction. A good overlap is achieved when the muscle fibers are at resting length.
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Which is NOT true when balancing chemical equations?
*
You must follow the Law of Conservation of Mass
Polyatomic ions appearing on both sides of the reaction should be treated like a single unit.
Balance larger molecules before smaller ones.
Single elements should be balanced first.
Balance larger molecules before smaller ones, is correct answer.
What is Chemical Equation?
A chemical equation is a symbol- and formula-based symbolic representation of a chemical reaction, with the reactant entities supplied on the left side and the product entities given on the right side.
Symbols are used in chemical equations to denote things like the direction of a reaction and the physical states of the reacting parties. In the year 1615, the French chemist Jean Beguin created the first chemical equation.
Chemical equations can be used to illustrate chemical reactions on paper; one such example is shown below (for the reaction between hydrogen gas and oxygen gas to form water).
2H2 + O2 → 2H2O
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the information effect of price suggests that many consumers, especially when faced with an uncertain purchase decision, think that a high price .
The trade off between perceived quality and perceived sacrifice affects perceived value.When the price is high,consumers perceive the quality of the product to be high.
When making a purchase, a customer values the benefit of a product more than its function. For example, a customer does not buy a drill to have a drill. He buys a drill to have the ability to make holes.From most SaaS companies, people buy not only software, but also solution. We believe that one of the first steps in building long-term relationships with customers is to get them to consume products that they have already purchased. Research has repeatedly shown that the extent to which customers use paid products in say one year determines whether they will repeat the purchase the next year.One field study,for example found that gym members who worked out four times a week were much more likely to renew their memberships than those who worked out just once a week.According to another study,customers who regularly used an enhanced cable television service.
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factors in an ecosystem that are helpful to the population and can increase the carrying capacity of the population are known as what?
A. Environmental resistance
B. Biotic potential
Answer:
Explanation:
Factors in an ecosystem that are helpful to the population and can increase the carrying capacity of the population are known as B. Biotic potential.
Environmental resistance put limits on the development of species in an ecosystem. So this factor can not increase the carrying capacity of the population.
Whereas, the biotic potential is the maximum capacity of species that can bring an increment in the population of the species. In the ideal condition species have potential capacity to reproduce.
So, biotic potential is the correct answer to this.
Determine the ratio of offspring with the described
trait to the total number of offspring:
Unattached earlobes and cleft chin
Unattached earlobes and no cleft
Attached earlobes and cleft chin
Attached earlobes and no cleft
The ratio of offspring with the described trait to the total number of offspring: unattached earlobes and no cleft. So, the correct option is (B).
What is Trait?A phenotypic trait is defined as a specific form of a phenotypic characteristic of an organism which may be either inherited or environmentally determined, but usually occurs as a combination of both.
A heredity-related trait is a specific characteristic of an individual which may be determined by genes, environmental factors, or a combination of both. These can be qualitative (such as eye color) or quantitative (such as height or blood pressure).
Thus, the ratio of offspring with the described trait to the total number of offspring: unattached earlobes and no cleft. So, the correct option is (B).
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The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis isSpermatogonia>spermatocyte>spermatid>spermsSpermatid>spermatocyte>spermatogonia>spermsSpermatogonia>spermatid>spermatocyte>spermsSpermatocyte>spermatogonia>spermatid>sperms
In a mature human testis, spermatogonia, spermatocytes, spermatids, and sperms should be formed in the proper order during the spermatogenetic process.
Spermatogenesis is the cycle by which haploid spermatozoa are formed. They develop from germ cells. These germ cells develop in the seminiferous tubules of the testis. This cycle begins with the mitotic division of immature microorganisms near the cell layer of the tubules. Thus the primary spermatocyte divides into two haploid daughter cells called secondary spermatocytes. Each secondary spermatocyte now undergoes a second. Each secondary spermatocyte now undergoes a second maturational division that is mitotic. Thus each secondary spermatocyte gives rise to two spermatids that are transformed to form two spermatozoa.
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TRUE OR FALSE abel these ftm tubes to demonstrate your understanding of the growth patterns of different organisms based on their metabolic need for or sensitivity to oxygen.
The FTM tubes can be labeled as follow on basis of the growth patterns of different organisms based on their metabolic needs:
1. Aerobic, 2. Microaerophilic, 3. Facultative, 4. Anaerobic
The term "metabolism" refers to the biological process that gives humans the energy they need to survive. People's metabolisms can vary from person to person; for example, some people may have a fast metabolism while others may have a slow one. This genetic and hereditary difference in metabolism.
But physical activity and exercise can momentarily change the metabolism from high to slow and from slow to high. When we exercise regularly, our body automatically uses more energy, changing our slow metabolism to a high metabolism.
The complete question is:
Label these FTM tubes to demonstrate your understanding of the growth patterns of different organisms based on their metabolic need for or sensitivity to oxygen.
Facultative, Aerobic, Microaerophilic, Anaerobic,
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proteins contain blank different amino acids whereas dna and rna are each composed of blank types of nitrogenous bases
DNA and RNA are the two primary subtypes of the nucleic acids.
Nucleotides, which have the five-carbon sugar backbone, one phosphate group, and a nitrogen base, are building blocks of both DNA and the RNA.
The building components of protein are amino acids. Long strands of the amino acids make up proteins. Numerous distinct proteins in the body each perform the vital functions. Each amino acid sequence in a protein is unique in nature. The protein's form and function in your body are determined by sequence.
DNA provides the instructions for the cell operations, and RNA turns those instructions into proteins to carry out cellular process.
The traits of an organism are formed by the DNA's sequence of nitrogen bases (A, T, C, and G).
The 5′-3′ phosphodiester linkage found in the nucleic acid molecules is made up of the nitrogen bases A and T (or U in RNA) and C and G.
DNA and RNA contains 4 types of the amino acids.
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help!!
a_____ force can cause a greater change in velocity.
And the answers are
Weaker
Vertical
Stronger
Kinetic
A bigger change in velocity might result from a stronger force.
What object has the most change in velocity?The object with less size will experience a greater change in velocity when 2 objects with different masses be subjected to the a force with the same strength.
What causes some objects' changes in velocity to be more noticeable than others?A force is required to change the velocity of an item.The force applied on the item and its direction affect the type of velocity change.A larger force can cause an object's velocity to change more dramatically.
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In addition to extending the thigh, the biceps femoris rotates the thigh ____ whereas the semimembranosus and semitendinosus rotate the thigh _____
In addition to extending the thigh, the biceps femoris rotates the thigh outwards; whereas the semimembranosus and semitendinosus rotate the thigh inwards.
The biceps femoris rotates the thigh outward (laterally) and the semimembranosus and semitendinosus rotate the thigh inward (medially).
When the biceps femoris contracts, it pulls the femur bone outward and back, resulting in a lateral rotation of the thigh. This outward rotation of the thigh is called external rotation and is commonly seen when executing a squat.
Conversely, when the semimembranosus and semitendinosus contract, they pull the femur bone inward and back, resulting in a medial rotation of the thigh. This inward rotation of the thigh is called internal rotation and is commonly seen when performing a lunge.
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A field guide for an area describes all the populations present as well as the abiotic components of that region. Which level of ecological organization
BEST describes the focus of this field?
The level of ecological organization is the ecosystem.
What is a population?We know that the term population has to do with the number of species that can be found in a given ecosystem that all share exactly the same characteristics. This implies that the organisms are able to interbreed.
The genetic make up of the organisms that make up a population must be just the same and would not change. Let us recall that the ecosystem refers to a self supporting unit that is composed of the living and the non living parts.
Thus, the ecosystem brings together the populations present in the region as well as the abiotic factors.
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Missing parts;
A field guide for one area describes all the populations present as well as the abiotic components of that region. Which level of ecological organization best describes the focus of this field guide?
answer choices
biome
biosphere
ecosystem
community
30. According to documents you read about the history of DDT, how was the
chemical first perceived by Americans?
as harmful, dangerous, and deadly
as a way to cure cancer, polio, and malaria
as too expensive to maintain production in America
as a groundbreaking solution for several problems
According to documents you read about the history of DDT, it was the chemical first perceived by Americans as harmful, dangerous, and deadly (Option a).
What is Dichlorodiphenyltrichloroethane (DDT)?Dichlorodiphenyltrichloroethane (DDT) is an insecticide used in many countries around the world in the past, which was disused due to serious harm to the health of humans and also life treating issues to wild life.
Therefore, with this data, we can see that dichlorodiphenyltrichloroethane (DDT) is a well-known insecticide that was disused and capable of causing harm to humans and also wild life in the ecosystems.
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The anterior and posterior roots of the thoracic spinal nerves merge to form a spinal nerve within an intervertebral foramen that is ______ to the vertebra
The anterior and posterior roots of the thoracic spinal nerves merge to form a spinal nerve within an intervertebral foramen that is inferior to the vertebra.
The spinal canal and periphery are connected through a passageway called the intervertebral foramen. At all levels of the spine, it is situated between the pedicles of nearby vertebrae. The intervertebral foramen's borders have been described using a variety of classification techniques. The foramen is traversed by several constructions. These include the transforaminal ligaments, communication veins between the internal and exterior plexuses, the spinal artery of the segmental artery, the root of each spinal nerve, and recurrent meningeal (sinu-vertebral) nerves.
The anterior and posterior roots of the thoracic spinal nerves merge to form a spinal nerve within an intervertebral foramen that is ______ to the vertebra?
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Order the steps of glycogen synthesis. Not all descriptions accurately describe glycogen synthesis; therefore, not all the descriptions will be used; four of the descriptions will be used in the correct answer.
1.Glucose phosphorylation. The first step in glycogen synthesis is conversion of glucose to G-6-P.
2.Glucose-1-phosphate formation.
3.Glucose activation.
4.Glucose addition to the polymer backbone
Glycogen synthesis starts with UDP-glucose phosphorylase, which combines the nucleotide uridine triphosphate (UTP) with glucose-1-phosphate to launch pyrophosphate (PPi) and form UDP-glucose. The phosphoanhydride change response catalyzed by way of UDP-glucose phosphorylase is minimally exergonic.
Glycogen synthase, as discussed in advance, catalyzes the price-restricting step in glycogen synthesis within the liver and in skeletal muscle, namely, the switch of glucose monomers from UDP-glucose to the terminal branch of the developing glycogen chain thru the formation of α(1→4) glycosidic bonds.
The glucagon signaling pathway is a method of a chain of extended blood glucose enzymatic reactions prompted with the aid of the binding of glucagon that produced by means of pancreatic islets alpha cells to the glucagon receptor on the surface of liver cells.
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Convenient occurs because heated material becomes..
Convection occurs because heated material becomes less dense and sinks and is therefore denoted as option D.
What is Convection?This is referred to as the process in which heat is transferred by movement of a heated fluid such as air or water.
When a molecule is heated, the atoms spread slightly further apart, occupying a larger volume which results in a decrease in the density.The heat energy then moves the material in liquids and gases because when they all are heated they expand and become less dense and sinks thereby making it the correct choice in this scenario.
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The full question is:
Convection occurs because heated material becomes. a. less dense and rises. b. denser and rises. c. denser and sinks. d. less dense and sinks.
THIS IS A MISTAKE DONT MIND IT
Recombination frequencies can be easily calculated by adding the
number of offspring that are different from the parents, then dividing by
the total number of offspring. Let's say you are studying fruit flies and
you cross a wild type, grey female with a vestigial, black male. The F1
offspring are as follows: 650 wild type/grey, 595 vestigial/black, 107
wild type/black, and 91 vestigial/grey. What is the recombination
frequency between the genes for wing type and body color?
The recombination frequency between the genes for wing type and body color is 0.10.
What is genes?Genes are sections of DNA that contain the instructions for the production of proteins and other molecules that are essential for the functioning of living organisms. Genes are the basic units of heredity, and are passed down from parent to offspring through gametes. They are made up of DNA, which is a long molecule made up of four different building blocks known as nucleotides. Genes are responsible for determining the characteristics and traits of an organism, such as eye color, hair color, and even intelligence. Genes are also responsible for the expression of proteins, which are the molecules that carry out the instructions of the genes.
This is because there are a total of 1,443 offspring and 108 of them are different from the parents (107 wild type/black and 91 vestigial/grey).
The recombination frequency is calculated by taking the number of different offspring (108) and dividing by the total number of offspring (1,443), which gives 0.10.
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Classify each item as being associated with light positioning (controlling how and where light strikes the retina) or sensory processing (how that information is processed). Occipital cortex Light Positioning Sensory Processing Ciliary bodies Pupi Cornea Ganglion cells Amacrine cells Accommodation Ciliary bodies Pupil Cornea Ganglion cells Amacrine cells Accommodation Bipolar cells Extrinsic muscles Photoreceptors Reset
The answer is:
light positioning (controlling how and where light strikes the retina) : extrinsic muscles, accommodation, cornea, pupil, ciliary bodies
sensory processing (how that information is processed): bipolar cells, ganglia cells, amacrine cells, occipital cortex, photoreceptors.
The eyes are among the organs of the visual system. They enable living creatures to perceive, analyze visual data, and carry out a variety of photoresponse activities that are not vision-dependent. When light is recognized by the eyes, electro-chemical impulses are then generated in the neurons (neurones). The eye in higher organisms is a complex optical system that collects light from the environment, regulates its intensity through a diaphragm, focuses it through an adjustable arrangement of lenses to form an image, converts this image into a series of electrical signals, and sends these signals to the brain via complex neural pathways that connect the eye via the cornea to the visual cortex and other regions of the brain.
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(blank) dating is the process of putting events or fossils in order from oldest to youngest without using actual dates.
Answer:
carbon
Explanation:
Answer: Carbon dating
Explanation: Carbon dating is the process of putting events or fossils in order from oldest to youngest without using actual dates.
8. How does upwelling affect the ocean ecosystem?
a. It increases the albedo of the ocean surface.
b. It brings nutrients from the ocean floor into the
surface currents.
c. It causes energy transfer that results in El
Niño/La Niña events.
d. It brings infrared radiation from the ocean floor
up to the ocean surface.
e. It brings ultraviolet radiation from the ocean
floor up to the ocean surface.
*THIS IS CLIMATE CHANGE*
After several weeks of exercise, a human athlete's resting heart rate is typically lower than before because
A) the body needs less oxygen than before.
B) the body temperature has increased.
C) the stroke volume has increased.
D) the cardiac output has decreased.
E) the body produces less carbon dioxide than before.
After several weeks of exercise, a human athlete's resting heart rate is typically lower than before because the stroke volume has increased. Thus, the correct option for this question is C.
Why is the resting heart rate of athletes lower?The resting heart rate of athletes might be found to be lower as compared to the normal person because exercise strengthens the heart muscle. It allows it to pump a greater amount of blood with each heartbeat.
More oxygen is also going to the muscles. This means the heart beats fewer times per minute than it would in a nonathlete. After training or exercising, stroke volume is increased at rest, during submaximal exercise, and during maximal exercise; conversely, posttraining heart rate is decreased, due to which the resting heart rate lowers.
Therefore, the correct option for this question is C.
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The video focuses on the lac operon, but there are others. For example, E. coli also have the trp operon, which has genes that code for enzymes necessary for synthesizing tryptophan, an amino acid necessary for protein synthesis. Like the lac operon, the trp operon has multiple genes under the control of one promoter.
Operons can be either inducible or repressible. Inducible and repressible operons share some characteristics, but they are different in key ways. Can you identify whether the lac and trp operons are inducible or repressible?
Sort each phrase to the appropriate bin.
a). The trp repressor protein is inactive, thus that is the right response. b). The promoter can be bound by RNA polymerase,
A trp operon is a collection of genes that code for the enzymes needed to synthesize the amino acid tryptophan. When tryptophan is present in low concentrations, the trp operon is active; conversely, when tryptophan is present, the trp operon is inactive. This is because it is a repressor protein and attenuation (coupled transcription and translation) controlled mechanism.
When tryptophan is present, the repressor binds to the operator of the DNA sequence, blocking the RNA polymerase's path and ending transcription. When tryptophan is absent, the repressor molecule is inactive and RNA polymerase can promote the transcription of genes after binding to the promoter sequence. Therefore, the right response is "inactive and promoter."
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