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

proteins are used to help move molecules more quickly. It is a process called facilitated diffusion. It could be as simple as bringing in a glucose molecule. Since the cell membrane will not allow glucose to cross by diffusion, helpers are needed. so the the correct chioice is D

Answer 2

Answer – D. Facilitated diffusion through protein channels
Glucose molecules are too big to pass through the plasma membrane by direct diffusion, so Glucose gains entrance into a cell by facilitated diffusion through protein channels in the plasma membrane. Since glucose moves with the concentration gradient, the built-in protein channels are only there to facilitate the movement of glucose into the cell and no energy is expended.