Glucose moves through a protein transporter down its concentration gradient into the cell. This is an example of ____.
A)diffusion
B)endocytosis
C)exocytosis
D)osmosis
E)facilitated diffusion

Question

Glucose moves through a protein transporter down its concentration gradient into the cell. This is an example of ____. ​
A)diffusion ​
B)endocytosis
C)exocytosis
D)osmosis
E)facilitated diffusion

Quizplus · Accepted Answer

Glucose requires a protein transporter to move across the cell membrane, indicating that it is too large or too polar to passively diffuse through the phospholipid bilayer. Facilitated diffusion is the passive transport of molecules across the membrane through protein channels or carriers. The fact that glucose moves down its concentration gradient also supports the idea that this is a facilitated diffusion process, rather than active transport (such as endocytosis or exocytosis). Therefore, the correct answer is E) facilitated diffusion.

Glucose Moves Through a Protein Transporter Down Its Concentration Gradient