Break down of glucose into pyruvate take place.

Options

A. Nucleus
B. Mitochondria
C. Chloroplast
D. Cytoplasm

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the breakdown of glucose into pyruvate takes place.

2. **Identifying the Process**: The breakdown of glucose is known as glycolysis. This is a crucial metabolic pathway that converts glucose into pyruvate.

3. **Location of Glycolysis**: Glycolysis occurs in the cytoplasm of the cell. This is where the enzymes necessary for the breakdown of glucose are located.

4. **Enzymatic Process**: Glycolysis is an enzymatic process that involves a series of 10 steps, each facilitated by a specific enzyme.

5. **Products of Glycolysis**: The end product of glycolysis is pyruvate (also known as pyruvic acid), which can then enter the mitochondria for further processing.

6. **Eliminating Incorrect Options**:
- **Nucleus**: The nucleus is primarily involved in storing genetic material (DNA) and does not participate in glucose breakdown.
- **Mitochondria**: While the mitochondria are involved in further energy production (like the Krebs cycle), glycolysis itself does not occur here.
- **Chloroplast**: Chloroplasts are involved in photosynthesis, not in the breakdown of glucose.

7. **Conclusion**: Therefore, the correct answer is that the breakdown of glucose into pyruvate takes place in the **cytoplasm**.

**Final Answer**: The breakdown of glucose into pyruvate takes place in the cytoplasm.

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