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Lactic dehydrogenase (LDH) that takes pa...

Lactic dehydrogenase (LDH) that takes part in cataysis of pyruvate `rarr` lactate is an example of

A

Isoenzyme

B

Zymogen

C

Coenzyme

D

Apoenzyme.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question:** The question asks for the classification of lactate dehydrogenase (LDH) in the context of its role in catalyzing the conversion of pyruvate to lactate. 2. **Identifying the Enzyme:** Lactate dehydrogenase (LDH) is an enzyme that catalyzes the reduction of pyruvate to lactate. This reaction is important in anaerobic respiration. 3. **Defining Isoenzymes:** Isoenzymes (or isoforms) are different forms of an enzyme that catalyze the same reaction but may differ in structure and kinetic properties. They can act on the same substrate but may have different regulatory properties or tissue distributions. 4. **Identifying the Isoenzymes of LDH:** LDH has five different isoenzymes, commonly referred to as LDH1, LDH2, LDH3, LDH4, and LDH5. Each isoenzyme has a slightly different structure and is found in different tissues or under different physiological conditions. 5. **Conclusion:** Based on the definition and characteristics of isoenzymes, lactate dehydrogenase (LDH) is classified as an isoenzyme because it has multiple forms that catalyze the same reaction of converting pyruvate to lactate. **Final Answer:** Lactate dehydrogenase (LDH) is an example of an isoenzyme. ---
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