Briefly explain what happens during Meosis 1.
Answer:
Explanation:
During meiosis one cell, divides twice to form four daughter cells. These four daughter cells only have half the number of chromosomes of the parent cell. they are haploid. Meiosis produces our sex cells or gametes. (eggs in females and sperm in males)
Help please asap help me
Answer: cells, chlorophyll, nucleus, chromosomes, organelles, interphase, endoplasmic
Chemosynthesis _______. Question 11 options: uses energy derived from hydrocarbons and hydrogen sulfide in place of solar energy produces carbohydrates and sugars occurs around hydrothermal vents near the oceanic ridge system Both a and c are correct. All of the above are correct.
Answer:
The answer is all of the above are correct.
Explanation:
Chemosynthesis occurs in bacteria and other organisms and involves the use of energy released by inorganic chemical reactions to produce food. All chemosynthetic organisms use energy released by chemical reactions to make a sugar, but different species use different pathways. For example, at hydrothermal vents, bacteria oxidize hydrogen sulfide and add carbon dioxide and oxygen to produce sugar, sulfur, and water:
CO2 + 4H2S + O2 ⇒ CH20 + 4S + 3H2O.
Chemosynthesis is the process by which food (glucose) is made by bacteria using chemicals as the energy source, rather than sunlight. Chemosynthesis occurs around hydrothermal vents and methane seeps in the deep sea where sunlight is absent. During chemosynthesis, bacteria living on the seafloor or within animals use energy stored in the chemical bonds of hydrogen sulfide and methane to make glucose from water and carbon dioxide (dissolved in seawater). Pure sulfur and sulfur compounds are produced as by-products.
Organizing a higher trophic levels tend to be fewer in number than those at lower tropic levels (true or false?
Answer:
True
Explanation:
external structure of Amoeba
Answer:
Structure of amoeba primarily encompasses 3 parts – the cytoplasm, plasma membrane and the nucleus. The cytoplasm can be differentiated into 2 layers – the outer ectoplasm and the inner endoplasm. The plasma membrane is a very thin, double-layered membrane composed of protein and lipid molecules.
Explanation:
What questions do you have about skin and skin color?
Answer:
nothing I have☺️☺️☺️☺️☺️☺️☺️☺️☺️
Which of the following is formed when a group of tissues works together to preform a common function
A. Body
B. Organ
C. Brain
D. Organ system
During respiration, carbon dioxide diffuses from the blood across the alveolus and into the lungs. Which factor increases the diffusion rate of carbon dioxide?
Explanation:
There are some factors which affect the rate of diffusion. These are:-
The partial pressure of oxygen.
The partial pressure of carbon dioxide.
Temperature.
The concentration of gases.
The thickness of the membrane.
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have a nice day :)
Answer:
the thickness of membrane
Which commercial fishing technique is associated with excessive bycatch?
O A. Long-line fishing
O B. Handline fishing
O C. Trolling
O D. Seining
HELP
Answer: D. Seining
Explanation:
Seine fishing refers to a method of fishing whereby a fishing net, which is referred to as a seine, is hanged vertically in the water.
Seining is typically done in water that is less than 12 feet in depth and it works well when the aquatic plants and the algae doesn't disturb the water. In the seining method, a large net on two poles is used and it's a commercial fishing technique is associated with excessive bycatch.
Answer:
Long line fishing
Explanation:
It gathers more than seining
Within the Phylum Mollusca, what is the
radula?
A. the organ that grinds up food before digestion
B. the organ that turns into the shell of the animals
C. the organ that circulates blood through the organism
Answer:
I think the ans is no.a ok
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What do you mean by photosynthesis?
bore D D D D
Answer:
photosynthesis is the process in which plant make food by themselves from using sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
Answer:
Photosynthesis is a process through which plants and other organisms transform light energy into chemical energy, which is then released to power the organism's metabolic processes through cellular respiration.
OAmalOHopeO :)
What is the process in genetic expression?
Answer:
Explanation:
Gene expression is the process by which the instructions in our DNA are converted into a functional product, such as a protein. It acts as both an on/off switch to control when proteins are made and also a volume control that increases or decreases the amount of proteins made.
A study is done on a group of families in Sweden that are segregating a genetic disorder. A statistical estimate of whether two genes, or a gene and a disease gene, are likely to be located near each other on a chromosome (called Lod-score analysis) indicates that the gene involved in the disorder shows a strong likelihood of linkage with a particular DNA marker locus. However, a second study done in Italy with other families segregating the same genetic disorder results in lod-score values that strongly indicate the lack of linkage between the gene and the same DNA marker locus. Assuming that both studies were performed appropriately, what is the most likely explanation for the different outcomes
Answer:
This disorder is caused by mutations in either of two different genes; one of these genes is linked to the DNA marker locus and the other gene is not.
Explanation:
A gene marker (also known as a molecular marker) is defined as a particular DNA sequence that has a specific physical location on a given chromosome. The gene markers are always physically linked with genes of interest, thereby they are useful for identifying patients affected by a given disease and/or a particular phenotypic trait. In this case, in the first study, genetic variation of the marker has been shown to be useful to map one locus that is associated with the disease phenotype. However, in the second study, a second locus that is not linked to the marker can segregate independently, thereby showing different results from the first study (in this case, it is imperative to develop a new genetic linkage analysis to discover genetic markers linked to the second gene, which is also responsible for the disease phenotype).
your body's internal feedback loops work by responding to???
A) information from the external environment
B) hormones from the pineal gland
C) changes in the internal environment
D) messages sent by the brain to body organs
Answer:
Option C
Explanation:
the drug which is used to reduce pain is ..,....
i) opium ii) bhang iii) hashish iv) marijauna
Answer:
hashish
Explanation:
opinum
Explanation:
because it is used to make pain nubbing/pain killer
Identify the incorrect statement regarding the fundamental causes of edema. Multiple Choice Capillary reabsorption does not depend on oncotic pressure. A deficiency of albumin (hypoproteinemia) produces edema by reducing the reabsorption of tissue fluid. Kidney failure leads to water retention and hypertension, thus raising capillary blood pressure and filtration rate. Obstruction of lymphatic vessels can interfere with fluid drainage and lead to the accumulation of tissue fluid distal to the obstruction. Since albumin is produced by the liver, liver diseases, such as cirrhosis, tend to lead to hypoproteinemia and edema.
Answer:
Capillary reabsorption does not depend on oncotic pressure
Explanation:
Edema refers to the swelling caused by the fluids trapped in the body's tissues, which swell from injury and/or inflammation. Edema can be associated with the decrease in plasma oncotic pressure, i.e., osmotic pressure exerted by proteins (especially albumin) in the blood vessel's plasma, the increase in hydrostatic pressure, or the increase in the capillary permeability. Moreover, capillary reabsorption refers to the movement of fluid from interstitial space to the capillaries, which is driven by the blood colloidal osmotic pressure. Lymphatic obstruction, i.e., the blockage of the lymph vessels that drain fluids from tissues, may cause edema in the part that is drained by the affected vessels (it is known as lymphedema). Moreover, liver/kidney failure may lead to edema by decreasing albumin and oncotic pressure. When plasma albumin levels drop because of liver diseases, the colloid osmotic pressure also decreases. In consequence, liver diseases, including stage 3 cirrhosis, lead to the development of swelling in the abdomen, thereby leading to edema.
Which of the following is a normal process of photosynthesis that could not occur if all reaction centers were inactivated by a toxin?
A. donation of excited electrons by chlorophyll a to a primary electron acceptor
B. absorption of photons by chlorophyll b
C. absorption of photons by carotenoids
D. donation of excited electrons by chlorophyll b to a primary electron acceptor
Answer:
A. donation of excited electrons by chlorophyll a to a primary electron acceptor
Explanation:
Photosystems are structures located at the thylakoid membrane that act to harvest energy light in order to convert it into chemical energy. Each photosystem is composed of a light-harvesting complex and a core complex, which in turn is composed of a reaction center. The photosynthetic reaction centers are multi-protein complexes that use light energy to catalyze the electron transfer across the chloroplast thylakoid membrane against a thermodynamic gradient. Moreover, antenna pigments are pigments that capture the energy from photons in order to transfer energy to other pigments in the photosystem (e.g., chlorophyll B and carotenes are antenna pigments, whereas chlorophyll A is the core pigment). Light energy absorbed by antenna pigments in the photosystems is transferred to the reaction center chlorophyll A molecules, thereby exiting electrons in the reaction center. A reaction center consists of two chlorophyll A molecules, which donate electrons to the primary electron acceptor.
(ii) Fish use their gills as a gas exchange surface.
Suggest three ways in which fish gills are adapted for efficient gas exchange.
(3)
1
2
3
Since the reason of the large surface area of the gills, gas exchange in fish is very efficient. the blood capillaries' large surface area in each gill filament The outer layer of the gill filaments as well as the capillary walls are only one cell thick due to the short distance required for diffusion.
What are gills?A gill is a respiratory organ found in many aquatic organisms that allows them to extract dissolved oxygen from water and expel carbon dioxide.
Some species' gills, such as hermit crabs, have adapted to allow them to breathe on land as long as they are kept moist.
Water runs over the gills as the fish opens its mouth, and blood in the capillaries picks up oxygen dissolved in the water. The blood then circulates through the fish's body to deliver oxygen, just as it does in humans.
Fish have gills, which allow them to "breathe" oxygen from the water. Water enters the mouth, travels through the gills, and exits the body via a special opening.
As the water passes over them, the gills absorb oxygen from it. The body of a fish is stream-lined.
Thus, these are the ways, in which fish gills are adapted for efficient gas exchange.
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Neurons are best described as:
Answer:
neutral?
Explanation:
How do the frequencies of the waves compare?
Wave A has a higher frequency because it has a larger amplitude.
Wave A has a lower frequency because it has a longer wavelength.
The waves have the same frequency because they have the same wavelength.
The waves have the same frequency because they have the same amplitude.
Answer:
The waves have the same frequency because they have the same amplitude.
Which of the following diseases is not caused by viruses?
Measles
Chickenpox
AIDS
Malaria
Answer:
malaria isn't caused by bacteria
Select the correct answer.
Why do plants excrete more carbon dioxide at night than during the day?
A.
Cellular respiration occurs only at night and not during the day.
B.
Cellular respiration occurs at a faster rate at night than during the day.
C.
Photosynthesis uses some of the carbon dioxide released during the day.
D.
The light-independent reaction of photosynthesis that releases carbon dioxide occurs at night.
Answer:
D
Explanation:
because they cannot do photosynthesis at night.
Answer:
The answer is C. Photosynthesis uses some of the carbon dioxide released during the day.
Explanation:
How is an RNA molecule different from a DNA molecule?
RNA is single stranded and composed of nitrogenous bases, a phosphate group, and a pentose sugar.
RNA is single stranded and composed of nitrogenous bases, a phosphate group, and a tetrose sugar.
RNA is a double-stranded helix and composed of nitrogenous bases, a fatty acid, and a pentose sugar.
RNA is single stranded and composed of nitrogenous bases, an amino acid, and a hexose sugar.
Answer:
RNA is single-stranded and composed of nitrogenous bases, a phosphate group, and pentose sugar.
Explanation:
RNA is different from DNA because instead of having two matching bases; it is only made of one strand of nitrogenous bases. These bases are attached to the phosphate, which holds the whole strand of RNA together. The sugar acts as a carrier for the bases. The sugar in RNA is known as ribose and contains 5 carbon molecules. This is why it is called pentose sugar.
Complete the table by filling in the missing information. Use these choices:
frameshift
substitution
7. UGU-CCG-GAA-CGA
UGC-CGG-GAA-CGA
8. GAA-CGU-AGC-GGU
GAU-CGU-AGC-GGU
9. UGU-UUC-CCU-UAA
UGU-UCC-CUU-AA
Answer:
7. Substitution mutation
8. Substitution mutation
9. Frameshift mutation
Explanation:
A substitution mutation is any kind of mutation that involves replacement of one or more nucleotide base by another in a sequence.
A frameshift mutation, on the other hand, is a mutation that changes the reading frame of the sequence. Two types of mutations cause frameshift viz: insertion and deletion mutation.
In the following sequences, mutation has occured as follows:
7. UGU-CCG-GAA-CGA to UGC-CGG-GAA-CGA - Substitution mutation has occured because nucleotides C and G has replaced C and U in the first and second codons respectively.
8. GAA-CGU-AGC-GGU to GAU-CGU-AGC-GGU- A substitution mutation because nucleotide U has replaced A in the first codon.
9. UGU-UUC-CCU-UAA to UGU-UCC-CUU-AA - A frameshift mutation because nucleotide U has been removed from the second codon, hence, causing a change in the reading frame.
What cycle of replication is used by the common cold virus?
A: Dormant cycle
B: Replication cycle
C: Lytic cycle
D: Lysogenic cycle
Answer:
C
Explanation:
The lytic cycle involves the reproduction of viruses using a host cell to manufacture more viruses; the viruses then burst out of the cell. The lysogenic cycle involves the incorporation of the viral genome into the host cell genome, infecting it from within.
The common cold virus is replicated using the lytic cycle, by introducing its genome into the host and using its cellular machinery, hence option c is correct.
How common cold virus replicate?The common cold virus is replicated by using the lytic cycle, in which the virus introduces its genome into the host genome and uses all the replicating machinery of the virus.
The lysogenic cycle is different from the lytic cycle in which the viral genome replicates on its own and does not integrate its genome into the host genome.
After replicating its genome with the host genome, the viral genome is excised from the host genome and assembled into new viral particles for infecting other host cells. The new viral particle lysed the host cell and spread to other cells.
Therefore lytic cycle is used by the common cold virus, hence option c is correct.
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Which of these is an example of an adaptive )or specific) immune response
What organelle must be present for a cell to be classified as eukaryotic?
nucleus
chromosomes
chloroplasts
ribosomes
List three of water’s unique properties.
Explanation:
1.water is called universal solvent it can dissolve almost every solute on it
2.water can show anamolus expansion which mean it density will me most on 4 degree celsius
3.it is neutral substance
Which of the following is a heterotroph?
*cyanobacteria
*gopher
*fir tree
*dandelion
__________ will increase soil nitrates, while ___________ will decrease soil nitrates.
A. Fast growing crops, heavy rains
B. Decomposers, lightning
C. Animal manure, fast growing crops
D. Denitrifying bacteria, Nitrifying bacteria
Answer:
A. Fast growing crops, heavy rains
Explanation:
Fast growing crops will increase soil nitrates, while heavy rains will decrease soil nitrates.
Animal manure has organic waste containing nitrogen that acts as a source of nitrate in the soil and growing crops absorb nitrate from the soil. Thus option C is correct.
What is nitrate?Nitrate is an organic compound of nitrogen that is present in the fertile soil and absorbed by the plants. The Source of nitrate is humus and fertilizer. Humus is obtained from animal manure, and dead and decaying animal and plant bodies.
Fast-growing crops absorb the nitrate from the soil and use it for development and growth such that nitrate decrese in soil. So option C is correct.
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