The cell membrane is made of a protein layer that is sandwiched between 2 phospolipid layers. It has pores that allow selective passage of substances in and out of the cell.
Structure B looks like a strand of mRNA leaving the nucleus. So the answer would be B.
Answer:
T3 (tri-iodothyronine) and T4 (thyroxine).
Explanation:
Answer:
Explanation:
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