D. Proteins help control substances by making trans-membrane channels.
As powerful as diffusion is, cells sometimes must move materials in the opposite direction—against a concentration difference. This is accomplished by a process known as active transport. As its name implies, active transport requires energy.
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When infected by a virus, a host cell produce many thousands of identical copies of the original virus. so the answer is B
hope this helps:)
Answer:
flourine ( F)
Explanation:
flourine has higher electronegativity than nitrogen (N)
