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.

d. facilitated diffusion through protein channels. Glucose is an important energy source of the body but it's too large to cross the cell membrane via simple diffusion. It can, however, be assisted to move across the cell through two types of active transport and facilitated diffusion. Through facilitated diffusion, carrier protein bind to glucose and change its shape, so it can go across the other side of the membrane.

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