Which of the following is a coenzyme?
NAD (Nicotinamide Adenine Dinucleotide) is a coenzyme that plays a key role in redox reactions.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
#enzyme cofactors
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Which of the following is an example of a cofactor required for enzyme activity?
Both Zn²⁺ and Mg²⁺ act as cofactors for various enzymes, helping in their catalytic activity.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Enzymes - Properties Classification and Cofactors
Enzymes that require a metal ion for activity are classified as:
Metalloenzymes is the scientifically accurate answer to this question. Within the study of Enzymes Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Metalloenzymes directly address what is being asked. Among the other options, Apoenzymes, Isoenzymes, and Zymogens do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
