An enzyme without its cofactor is called a/the _.
Correct answer: B. Apoenzyme
- A. Coenzyme
- B. Apoenzyme
- C. Holoenzyme
- D. Proenzyme
Explanation
Option A : If the non-protein part of the enzyme is loosely attached to the protein part of the enzyme, it is known as a coenzyme. Option B: An enzyme without a non-protein part (cofactor) is known as an apoenzyme. It is an inactive form of the enzyme. Option C : A complete enzyme including cofactor is known as the holoenzyme. It is the active form of the enzyme.Option D : Inactive enzyme precursors such as pepsinogen for pepsin are called proenzyme or zymogen.
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Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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