Answer:
The environments in which cells grow often change rapidly. For example, cells may consume all of a particular food source and must utilize others. To survive in a changing world, cells evolved mechanisms for adjusting their biochemistry in response to signals indicating environmental change. The adjustments can take many forms, including changes in the activities of preexisting enzyme molecules, changes in the rates of synthesis of new enzyme molecules, and changes in membrane-transport processes.
Initially, the detection of environmental signals occurred inside cells. Chemicals that could pass into cells, either by diffusion through the cell membrane or by the action of transport proteins, and could bind directly to proteins inside the cell and modulate their activities.
Answer:
the moon and the sun line up above earth and sometimes creates eclipses.
Explanation:
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Phototropism refers to the growth or movement of an organism (often a plant) in response to light stimulus. Negative phototropism occurs when an organsim grows away from specific chemicals.
- If a plant is grown in the absence of gravity, its roots will exhibit negative phototropism and auxin hormones will accumulate on the side away from the light source (Option C is correct).
- In this case, negative phototropism occurs in response to auxin hormones.
- On the other hand, positive phototropism occurs when a plant grows towards the light source.
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Answer:
the deer mice that stood out and the "mutated" mice got to live longer and reproduce more becaause they blended in.
Explanation:
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