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nmdcat.online July 11, 2026

Regarding the active site of an enzyme, the most accurate description is that it

A. Is a rigid, lock-like structure that perfectly fits the substrate
B. Consists of the entire three-dimensional structure of the protein
C. Is a flexible, three-dimensional cleft that binds and transforms the substrate
✓
D. Functions independently of any non-amino acid components in the holoenzyme

📝 Explanation

The active site is a specific, flexible 3D pocket formed by a few amino acids that binds the substrate and catalyzes its conversion to product via weak interactions.

📖 Additional Information

  • Is a rigid, lock-like structure that perfectly fits the substrate
  • Consists of the entire three-dimensional structure of the protein
  • Is a flexible, three-dimensional cleft that binds and transforms the substrate
  • Functions independently of any non-amino acid components in the holoenzyme

The active site is a specific, flexible 3D pocket formed by a few amino acids that binds the substrate and catalyzes its conversion to product via weak interactions.

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