Biology Enzymes UHS 2023
PMDC Verified Question 26 of 79
The active sites of enzymes are composed of?
A
Few nucleosides
B
Few nucleotides
C
Few amino acids
D
Few saccharides
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Few amino acids
Concept:

Despite an enzyme being a massive protein structure containing hundreds of monomers, the business end of the molecule is remarkably small.

Solution:

  • Since enzymes are proteins, their foundational building blocks are amino acids.
  • The active site is a tiny, highly specific geometric pocket on the enzyme's surface.
  • It is composed of a strictly arranged configuration of just a few amino acids (typically 3 to 12 residues) whose R-groups perfectly interact with the substrate.


Why other options are incorrect:

Nucleotides/nucleosides form DNA and RNA. Saccharides form carbohydrates. Only amino acids form the active sites of protein enzymes.

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