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Assertion : The first step in TCA cycle ...

Assertion : The first step in TCA cycle is the condensation of pyruvate with oxaloacetic acid and water.
Reason : This reaction is catalysed by enzyme pyruvate synthase.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that the first step in the TCA cycle is the condensation of pyruvate with oxaloacetic acid and water. - **Evaluation**: This statement is incorrect. The TCA cycle (also known as the Krebs cycle or citric acid cycle) actually begins with the condensation of an acetyl group (derived from acetyl-CoA) with oxaloacetic acid, not pyruvate. 2. **Understanding the Reason**: The reason provided states that this reaction is catalyzed by the enzyme pyruvate synthase. - **Evaluation**: This statement is also incorrect. The enzyme that catalyzes the reaction where acetyl-CoA combines with oxaloacetic acid to form citric acid is called citrate synthase, not pyruvate synthase. 3. **Conclusion**: Both the assertion and the reason are false. Therefore, the correct answer is that both the assertion and reason are false statements. ### Final Answer: Both the assertion and reason are false. ---
### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that the first step in the TCA cycle is the condensation of pyruvate with oxaloacetic acid and water. - **Evaluation**: This statement is incorrect. The TCA cycle (also known as the Krebs cycle or citric acid cycle) actually begins with the condensation of an acetyl group (derived from acetyl-CoA) with oxaloacetic acid, not pyruvate. 2. **Understanding the Reason**: The reason provided states that this reaction is catalyzed by the enzyme pyruvate synthase. - **Evaluation**: This statement is also incorrect. The enzyme that catalyzes the reaction where acetyl-CoA combines with oxaloacetic acid to form citric acid is called citrate synthase, not pyruvate synthase. ...
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