Biology Enzymes ETEA 2023 Retake
PMDC Verified Question 22 of 79
The coenzyme NAD is made up of:
A
Vitamins
B
Sugar
C
Amino acids
D
Nucleotides
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Nucleotides
Concept:

To understand the function of a coenzyme, we must look at its underlying biochemical structure and its full chemical name.

Solution:

  • NAD stands for Nicotinamide Adenine Dinucleotide.
  • As the name implies, it is structurally composed of two distinct nucleotides joined together by their phosphate groups.
  • One nucleotide contains an adenine base, and the other contains nicotinamide.


Why other options are incorrect:

While NAD is functionally derived from a vitamin (niacin), its physical structural building blocks are nucleotides. It is not made of amino acids (proteins) or simple sugars alone.

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