Glycolysis starts and ends in the :

Options

A. cytoplasm
B. plasma membrane
C. nucleus
D. mitochondrion

Explanation

**Step-by-Step Solution:**

1. **Understanding Glycolysis**: Glycolysis is a metabolic process that breaks down glucose into pyruvate, producing energy in the form of ATP and NADH in the process.

2. **Identifying the Starting Point**: Glycolysis begins with the molecule of glucose. This is the first step where glucose is phosphorylated and converted into glucose-6-phosphate.

3. **Identifying the Ending Point**: The process of glycolysis ends with the formation of two molecules of pyruvate from one molecule of glucose.

4. **Locating the Site of Glycolysis**: Glycolysis does not occur in membrane-bound organelles. Instead, it takes place in the cytoplasm of the cell.

5. **Conclusion**: Therefore, glycolysis starts and ends in the cytoplasm.

**Final Answer**: Glycolysis starts and ends in the cytoplasm.

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