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BIO NMDCAT BIOLOGICAL MOLECULES
nmdcat.online June 27, 2026

The most appropriate description of an enzyme’s active site is a

A. Permanent, rigid groove on the enzyme's surface
B. Flexible, three-dimensional cleft formed by the folding of the polypeptide chain
✓
C. Sequence of amino acids at the N-terminus of the enzyme
D. Non-protein component essential for catalysis

📝 Explanation

The active site is a 3D pocket formed by amino acid residues brought together via the protein's tertiary folding. It is complementary to the substrate's shape and chemistry, and models like "induced fit" show it is flexible, not rigid.

📖 Additional Information

  • Permanent, rigid groove on the enzyme's surface
  • Flexible, three-dimensional cleft formed by the folding of the polypeptide chain
  • Sequence of amino acids at the N-terminus of the enzyme
  • Non-protein component essential for catalysis

The active site is a 3D pocket formed by amino acid residues brought together via the protein's tertiary folding. It is complementary to the substrate's shape and chemistry, and models like "induced fit" show it is flexible, not rigid.

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