Peptides and small proteins are generally too large to be transported into cells using transport proteins or moving through pores. The macromolecules are brought into the cell using
A) diffusion
B) exocytosis
C) gated channels
D) endocytosis
E) open channels

Question

Quizplus · Accepted Answer

Endocytosis is the process by which larger molecules or particles are brought into the cell by the formation of vesicles from the cell membrane. This is the main mechanism by which peptides and small proteins are transported into cells, as they are too large to pass through the cell membrane. Options A, C, and E are incorrect as they involve transport through channels or diffusion, which is not feasible for large molecules like peptides and small proteins. Exocytosis is the opposite of endocytosis and involves the release of substances from the cell, so it is also not relevant for the transport of peptides and small proteins into the cell.

Peptides and Small Proteins Are Generally Too Large to Be