In Krebs cycle,

Options

A. ADP is converted into `CO_(2)`
B. Pyruvic acid is converted into `CO_(2)` and `H_(2)O`
C. Glucose is converted into `CO_(2)`
D. Pyruvic acid is converted into ATP

Answer

**Step-by-Step Solution:**

1. **Understanding the Krebs Cycle**: The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur after glycolysis. It is essential for the aerobic respiration process in cells.

2. **Starting Material**: The cycle begins with pyruvic acid (or pyruvate), which is produced from glucose during glycolysis.

3. **Conversion of Pyruvic Acid**: In the Krebs cycle, pyruvic acid is converted into acetyl coenzyme A (acetyl CoA). This conversion involves the release of carbon dioxide (CO2) and the production of NADH from NAD+.

4. **Chemical Reaction**: The reaction can be summarized as:
- Pyruvic acid + CoA + NAD+ → Acetyl CoA + NADH + CO2 + H+
This indicates that during the conversion of pyruvic acid, carbon dioxide is released.

5. **Evaluating the Options**:
- **Option 1**: "ADP is converted into carbon dioxide" - This is incorrect because ADP is not involved in the release of carbon dioxide.
- **Option 2**: "Pyruvic acid is converted into carbon dioxide and H2O" - This is correct as pyruvic acid is indeed converted into carbon dioxide, and water is also released during the cycle.
- **Option 3**: "Glucose is converted into carbon dioxide" - This is incorrect because glucose is broken down into pyruvic acid during glycolysis, not directly into carbon dioxide in the Krebs cycle.
- **Option 4**: "Pyruvic acid is converted into ATP" - This is incorrect as ATP is not produced directly from the conversion of pyruvic acid in the Krebs cycle.

6. **Conclusion**: The correct statement regarding the Krebs cycle is that "pyruvic acid is converted into carbon dioxide and H2O".

**Final Answer**: Pyruvic acid is converted into carbon dioxide and H2O.

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