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  • Which of the following is not a protein?
Multiple choice

Which of the following is not a protein?

  1. Antibody

  2. Insulin

  3. Pepsin

  4. NAD+

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibodies, insulin, and pepsin are proteins. NAD+ (Nicotinamide adenine dinucleotide) is a coenzyme, not a protein.

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