Which of the following is a characteristic feature of a carrier protein in a plasma membrane?
A) It is a peripheral membrane protein.
B) It exhibits a specificity for a particular type of molecule.
C) It requires the expenditure of cellular energy to function.
D) It works against diffusion.
E) It has few, if any, hydrophobic amino acids.

We know that carrier proteins are proteins that facilitate the movement of specific molecules across a permeable membrane. With that said, D is incorrect because they perform facilitated diffusion. C is incorrect because diffusion should never require energy, no matter what form or molecule. E is incorrect because the cell membrane has hydrophilic (water-loving) heads and hydrophobic (water-repelling) tails, so the molecule must contain certain amino acid types in order to pass substances through. They are not peripheral membrane proteins because they usually stay on the membrane and never leave it (under most cases). This leaves B to be the only correct answer.

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luisvaschetto luisvaschetto · Answer 2 · 2021-09-24T13:58:27+02:00

A characteristic feature of a carrier protein in a plasma membrane is the fact that it exhibits specificity for a particular type of molecule (Option B).

Carrier proteins are cell membrane proteins that are responsible for the transport of substances in and out of cells.

These proteins (carriers) move molecules by both passive transport (facilitated diffusion) and active transport mechanisms.

For example, the sodium-glucose cotransporter is a carrier protein that mediates the specific movement of sodium ions and glucose molecules across cell membranes.

In conclusion, a carrier protein in a plasma membrane exhibits specificity for a particular type of molecule (Option B).

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