Very large molecules (macromolecules)can be transported across membranes by ________.
A)pores or channels with very large openings through the center
B)active transport proteins
C)diffusion down a concentration gradient
D)endocytosis or exocytosis

Question

Quizplus · Accepted Answer

Endocytosis or exocytosis are the mechanisms by which very large molecules (macromolecules) can be transported across membranes. Pores or channels with very large openings through the center would allow smaller molecules to pass through but not necessarily very large ones, and diffusion down a concentration gradient would only work for small molecules. Active transport proteins could facilitate the transport of some larger molecules, but not to the extent that endocytosis or exocytosis would.

Very Large Molecules (Macromolecules)can Be Transported Across Membranes by ________