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nmdcat.online July 3, 2026

75. The mechanism by which large, polar hydrophilic molecules (like glucose or amino acids) cross the plasma membrane of both animal and plant cells along their concentration gradient is

A. Simple diffusion
B. Facilitated diffusion via transport proteins
✓
C. Active transport utilizing ATP
D. Endocytosis

📝 Explanation

Polar molecules cannot pass through the hydrophobic lipid core directly; they require channel or carrier proteins to cross without using energy.

📖 Additional Information

  • Simple diffusion
  • Facilitated diffusion via transport proteins
  • Active transport utilizing ATP
  • Endocytosis

Polar molecules cannot pass through the hydrophobic lipid core directly; they require channel or carrier proteins to cross without using energy.

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