Question

Cells require glucose as a source of energy to carry out life processes. Large molecules like glucose cross the cell's plasma membrane by

A) being pumped through ion channels.
B) active transport through protein channels.
C) passive diffusion through the lipid bilayer.
D) facilitated diffusion through protein channels.

Answer 1

Answer: The correct option is D

Explanation: The transport of glucose through the cell membrane is carried out by two types of proteins: transporters of glucose coupled to sodium, and proteins facilitating the transport of glucose. In both cases, the method of transport is the facilitated diffusion through protein channels.