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The first member of the TCA cycle is...

The first member of the TCA cycle is

A

Acetyl CoA

B

Citric acid

C

OAA

D

Pyruvic acid

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the TCA Cycle**: The TCA cycle, also known as the Krebs cycle or citric acid cycle, is a crucial metabolic pathway that plays a key role in cellular respiration. It occurs in the mitochondria of cells. 2. **Identifying the First Member**: The first member of the TCA cycle is Acetyl-CoA. This molecule is derived from carbohydrates, fats, and proteins and enters the cycle to begin the process of energy production. 3. **Formation of Citrate**: Once Acetyl-CoA enters the TCA cycle, it combines with oxaloacetate (another molecule present in the cycle) to form citrate (citric acid), which is the first compound in the cycle. 4. **Conclusion**: Therefore, the first member of the TCA cycle is Acetyl-CoA, which is then converted into citrate. ---
**Step-by-Step Solution:** 1. **Understanding the TCA Cycle**: The TCA cycle, also known as the Krebs cycle or citric acid cycle, is a crucial metabolic pathway that plays a key role in cellular respiration. It occurs in the mitochondria of cells. 2. **Identifying the First Member**: The first member of the TCA cycle is Acetyl-CoA. This molecule is derived from carbohydrates, fats, and proteins and enters the cycle to begin the process of energy production. 3. **Formation of Citrate**: Once Acetyl-CoA enters the TCA cycle, it combines with oxaloacetate (another molecule present in the cycle) to form citrate (citric acid), which is the first compound in the cycle. ...
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Knowledge Check

  • TCA cycle is a

    A
    Direct oxidation pathway
    B
    Indirect oxidation pathway
    C
    Amphibolic pathway
    D
    Both (2) and (3)

  • The first compound of TCA cycle is

    A
    Oxalo succini acid
    B
    Oxalo acetic acid
    C
    Citric acid
    D
    Cis aconitic acid

  • 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

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