Secreted Proteins Cross the Mem Brane of the ER

Question

Secreted proteins cross the mem brane of the ER
A) By diffusion
B) By active transport
C) Through a channel provided by a translocon
D) By osmosis
E) Through a channel made by the SRP

Accepted Answer

Secreted proteins cross the membrane of the endoplasmic reticulum (ER) through a channel provided by a translocon, which is a complex of proteins that forms a conduit for polypeptide chains to move into the ER lumen.