Pyruvic acid is formed at the end of

Options

A. Calvin cycle
B. Glycolysis
C. Krebs cycle
D. Pentose phosphate way.

Answer

To answer the question "Pyruvic acid is formed at the end of which of the following reactions?", we can follow these steps:

### Step 1: Understand the process of glycolysis
Glycolysis is the metabolic pathway that converts glucose into pyruvate. It occurs in the cytoplasm of the cell and does not require oxygen, making it an anaerobic process.

### Step 2: Identify the substrate
The substrate for glycolysis is glucose, a six-carbon molecule. During glycolysis, glucose is broken down into two molecules of pyruvate, which are three-carbon compounds.

### Step 3: Review the options given
1. **Kelvin cycle**: This is part of photosynthesis, not respiration, and does not produce pyruvic acid.
2. **Glycolysis**: This is the correct answer, as it directly leads to the formation of pyruvic acid from glucose.
3. **Krebs cycle**: This cycle occurs after glycolysis and processes pyruvate but does not produce pyruvic acid.
4. **Pentose phosphate pathway**: This pathway is involved in the metabolism of carbohydrates but does not produce pyruvic acid.

### Step 4: Conclusion
Based on the information above, the correct answer is that pyruvic acid is formed at the end of **glycolysis**.

### Final Answer
Pyruvic acid is formed at the end of glycolysis.

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