reviewing Meiosis:
Diagram the phases of meiosis using colored pencils to show the homozygous pairs.
a. the starting cell is 2n. how many chromosomes does it have?
b. hom many chromosomes will it have after Meiosis 1?
c. how many chromosomes will it have after Meiosis 2?​

Answer/Explanation:

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.

Source:

https://www2.estrellamountain.edu/faculty/farabee/biobk/biobooktransp.html#:~:text=Water%2C%20carbon%20dioxide%2C%20and%20oxygen,to%20cross%20the%20cell%20membrane.

Hope this helps!

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis.

Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.

All cells have a cell membrane, also known as a plasma membrane, which separates the interior of the cell from the external environment.

A semipermeable lipid bilayer makes up the cell membrane. The movement of materials into and out of the cell is controlled by the cell membrane. The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions.

Therefore, Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis.

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Answer:

A stable condition

Explanation:

Dictionary Definition- a tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes

Answer:

A Stable Condition

The tendency of a system, especially the physiological system of higher animals, to maintain internal stability, owing to the coordinated response of its parts to any situation or stimulus that would tend to disturb its normal condition or function.

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Answer:

I believe its either lipids or proteins.

Explanation:

Sorry if I'm wrong!

Patient 3 blood contains A antigen and Rh antigen.

Antibody-antigen reactions are reactions which occur when matching antigens and antibodies are mixed together.

In blood, antigen-antibody reactions result In agglutination of blood.

In the image shown, when Patient 3 blood is mixed with anti-A and anti-Rh aggluitination occurs, but no agglutination occurs with anti-B.

Therefore, Patient 3 blood contains A antigen and Rh antigen.

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Answer: B Antigen

Explanation: Other answer is wrong lol

The autonomic nervous system is responsible for regulating involuntary body activities.

Involuntary activities such as circulation, heartbeat, digestion, breathing, and peristalsis for example are generally not under our conscious control.

These are otherwise known as involuntary actions controlled by the autonomic nervous system which in turn is a subdivision of the peripheral nervous system (this system branches off the spinal cord to all other parts of the body.

Other parts of the nervous system would be the central nervous system divided into:

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Answer:

The cause of the 90 decreases in southern California steelhead run sizes are because of the dams along the water sources and it has cause 90% decrease in the southern California steelhead run sizes. The Dam alter aquatic ecology cause the river hydrology up steam and down steam which cause the affecting water quality.

The reason why the Southern California steelhead run sizes has decreased by 90% is the construction of dams along water sources.

The dam is a large structure that serves the purpose of holding back water and making its level to rise quite high. Dams could be used for the purpose of electricity generation.

The reason why the Southern California steelhead run sizes has decreased by 90% is the construction of dams along water sources.

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True. While operating a vehicle on any highway of this state, it it illegal to physically hold or support a wireless device with any part of the body

These are the basic guides used by US government to control accident or reckless driving on the roads.

Some of the basic driving rules include the following;

Thus, the statement is true.

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Some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).

A virus is a non-living entity that needs a suitable host to reproduce its genetic material (DNA or RNA).

Viruses may contain a genetic material composed of other DNA or RNA but not both.

In conclusion, some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).

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The event that occurs at the end of the germinal period is the zygote being implanted in the uterus walls.

The germinal period is the phase ranging from fecundation to zygote implantation into the uterus.

This period (germinal phase) is characterized by the generation of a zygote from germinal cells.

In conclusion, the event that occurs at the end of the germinal period is the zygote being implanted in the uterus walls.

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Answer:

solar radiation

Explanation:

Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays.

Answer:

Explanation:The origin of human beings from far more primitive ape-like precursors is one — just one — of the definitions of “evolution” that the public and the media carry around in their heads. Not surprisingly, the iconic transition from ape to man is the first, second, and third image.

Vertebrate chordates differ from invertebrate chordates by the presence of the vertebral column.

Chordates are of two groups - vertebrates and invertebrates.

The vertebrate chordates have vertebral columns which developed from the notochord.

The invertebrate chordates, even though possess notochords at some points in their life, do not have vertebral columns.

Vertebrate chordates include fishes, birds, reptiles, and mammals. Invertebrate chordates include the tunicates and the lancelets.

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The backward (opposite of its normal direction) flow of a body fluid is called reflux.

Reflux refers to the opposite movement of a body fluid during physiological functions.

For example, acid reflux refers to the burning sensation due to the movement of stomach acid to the throat.

In conclusion, the backward (opposite of its normal direction) flow of a body fluid is called reflux.

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According to the research, sensory neurons transmit the information from the receptors to the spinal cord.

They are those neurons located in sensory organs or in areas of the nervous system related to the integration of sensations.

These transmit the information from receptors in the body's tissues and sensory organs to the spinal cord.

Therefore, we can conclude that according to the research, sensory neurons transmit the information from the receptors to the spinal cord.

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Answer:

To break down bacteria

Explanation:

Answer:

it contains lytic enzymes that destroy aged and unwanted cell organelles. it sometimes destroys the entire cell.the key point is it destroys aged and unwanted cell organelles.

Answer:

O2 participates in cellular respiration

Explanation:

The only place that O2 participates in cellular respiration is at the end of the electron transport chain, as the final electron acceptor. Oxygen's high affinity for electrons ensures its success in this role.

The value that can be withdrawn from case 1 is the activeness of the government that takes some crucial steps to maintain the biodiversity of the forests. The value that can be withdrawn from case 2 is the sincerity of native people towards nature who make a lake a sacred grove and start worshipping it in order to maintain the biodiversity of that lake.

Biodiversity may be defined as the sum total of all the living entities living in a particular area at a given time.

For maintaining the biodiversity of the forest as well as a lake, it is required not to deteriorate the natural ecosystem of those regions by human activities like over grazing, forest fires, over harvesting, industrialization, etc.

If the forest has not been declared a biodiversity hotspot, the time will not be far to announce that a forest becomes a bare area, where no species live, survive, and reproduce naturally.

Therefore, it is well described above.

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Bacteria sample A utilizes citrate while sample B does not.

Simmons citrate agar is a nutrient agar which contains the compound sodium citrate as a carbon source for microorganisms.

It is used to differentiate bacteria based on their use of citrate as a sole source of carbon.

A positive result for for citrate utilization will change the agar from green to blue while a negative result will remain green.

Therefore, since bacterial sample A produced a blue color while sample B agar remained green, A utilizes citrate while B does not.

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Answer:

A.

Explanation:

Exercise can reduce dopamanergic activity and manic episodes.

Bipolar Disorder, intended for Manic-Depressive Illness, is an illness that can alter mood with repeated bouts of opinion and "mania". Either of the two types of crisis can predominate in the same person and its frequency is quite variable.

In this case, to help prevent a manic episode is necessary to avoid triggers such as caffeine, alcohol or drug use, and stress, most importante is exercise.

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The sucrose moved in sink by active transport.

Active transport is a type of transport in which the cell expends energy to move solutes against their concentration gradients. The sodium-potassium pump is an example of active transport. Active transport differs from passive transport in that the cell does not expend energy.

In this case, the sucrose moves from companion cells in sink elements by active transport. This reduces the water potential of the sink element  by osmosis, which increases the hydrostatic pressure.

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A botanist scrapes pollen off a flower of one plant and then uses it to pollinate the flower of another plant. What can be scientifically concluded about their offspring?

A. They will have a large amount of genetic variation.

B. They will have twice the number of chromosomes as their parents.

C. They will be genetically distinct from their parents.

D. They will be able to reproduce only asexually.

Plants' xenogamous system has high probabilities of introducing genetic variation between plants. Option A) They will have a large amount of genetic variation.

There are two general crossing systems in plants, which depend on pollination type.

Sexual reproduction gives more possibilities to different alleles of a gene that did not appear in one generation to express in the next generation.

Both types of pollination allow genetic variation, however by the occurrence of crossed pollination there are more chances to ensure the variability of the species and survival to environmental changes.

While by self-pollination there are more chances to express the same genotype of the parental plant.

The Xenogamous system has the advantage of avoiding the effects of endogamy in a population by increasing genetic variability.

In the exposed example, the botanist is acting as the pollinator agent, allowing one plant's pollen grain to fertilize the egg of the other plant.

The merging of these gametes will introduce variation since there will new allelic combinations.  

The correct option is A). They will have a large amount of genetic variation.

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According to the research, the statement is true, animal viruses often have glycoprotein spikes on their capsids or envelopes.

It is an obligate intracellular parasite, small in size, made up of nucleic acid and protein.

They have a layer or envelope of lipids and glycoproteins, which they obtain from the cell membrane of their host cells, and which is used to inject genetic material into the cell.

Therefore, we can conclude that according to the research, the statement is true, animal viruses often have glycoprotein spikes on their capsids or envelopes.

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Answer:

Explanation:

Haploid Cells

Haploid cells contain only one set of chromosomes. Gametes or sex cells are the most common type of haploid cells. They are produced by meiosis and are genetically diverse. When the haploid cells from male and female fuse together during fertilization, it forms a diploid cell.

Diploid Cells

These cells have two sets of chromosomes. It is formed by the fusion of two haploid cells. Most mammals are diploid, i.e., they have two homologous copies of each chromosome in the cells. They are produced by mitosis. The somatic cells in humans are diploid cells.

Biodiversity rises with altitude initially before falling with height beyond that. Up until it reaches a diversity peak at about 1 300 to 1 800 m.

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ANSWER

Both flowing plants and animal pollinators are incredibly diverse. One reason for this diversity is the close

relationship they have with one another. Over many years, some flowers and pollinators have influenced each

other's evolution. Today, when flower-pollinator pairs have traits that work very well together, it's a sign

this kind of evolution may have happened.

The relationship between its volume and surface area limits how large a cell can get.

The range of a cell is defined as the quantity of material that can be found within a cell with respect to the surface area.

The range of a cell is limited by the volume and the surface area which means that the wider the surface area the more volume the cell can contain.

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