The substances in cell membranes that form a barrier to the movement of materials across the membrane are

A) carbohydrates.
B) nucleic acids.
C) lipids.
D) external proteins.
E) internal proteins.


C

Biology & Microbiology

You might also like to view...

What evidence is there that choanoflagellates were the ancestors to animals? What will be an ideal response?

Biology & Microbiology

Animals that feed on bacteria and fungi are called ________

Fill in the blank(s) with correct word

Biology & Microbiology

Cells acquire low-density lipoproteins (LDLs) by

A) diffusion. B) receptor-mediated endocytosis. C) exocytosis. D) phagocytosis.

Biology & Microbiology

Paranthropus robustus and Australopithecus africanus are always found in the same deposits

a. true b. false

Biology & Microbiology