Moderate

Transport of glucose across the cell membrane occurs by:

Correct answer: B. Facilitated diffusion

  • A. Simple diffusion
  • B. Facilitated diffusion
  • C. Osmosis
  • D. Primary active transport
  • E. Secondary active transport

Explanation

The transport of glucose requires special carrier proteins to take place since glucose is a very large polar molecule that cannot simply diffuse across the cell membrane. Hence, facilitated diffusion of glucose occurs through GLUT transporters present in most body cells, so the answer is B. Glucose may also be transported via secondary active transport in certain scenarios such as sodium glucose cotransporters present in the intestinal epithelium or proximal convoluted tubule cells as glucose transport is driven by the concentration gradient of sodium created by the action of the Na/K ATPase pump, but the question did not specify so facilitated diffusion is preferred.

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