Some proteins that are on the surface of mammalian cells contain carbohydrates. These proteins are synthesized by _______ and the sugars added in the _______.
A) mitochondrial ribosomes; smooth endoplasmic reticulum
B) the rough endoplasmic reticulum; Golgi apparatus
C) cytoplasmic ribosomes; smooth endoplasmic reticulum
D) Golgi apparatus; rough endoplasmic reticulum
E) cytoplasmic ribosomes; plasma membrane

Question

Quizplus · Accepted Answer

Proteins with carbohydrates on their surface are glycoproteins, and they are synthesized by attaching sugars to amino acid residues during protein synthesis on the rough endoplasmic reticulum. They are then modified and processed in the Golgi apparatus before being transported to the plasma membrane or secreted from the cell.

Some Proteins That Are on the Surface of Mammalian Cells