Multiple choice

Glucose diffuses rapidly across the plasma membrane by

  1. active diffusion

  2. osmosis

  3. facilitated diffusion

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glucose is a large, polar molecule that cannot diffuse directly through the hydrophobic lipid bilayer of the plasma membrane. It requires facilitated diffusion using specific transporter proteins (GLUT proteins) to cross rapidly down its concentration gradient. This process differs from active transport (requires energy) and osmosis (water movement only).

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