Cellular respiration first begins in

Options

A. Cytoplasm
B. Carbohydrates
C. Nucleic acid
D. Organic acids.

Answer

**Step-by-Step Solution:**

1. **Understanding Cellular Respiration**: Cellular respiration is a metabolic process that involves the breakdown of organic substances to release energy. This process is essential for the production of ATP (adenosine triphosphate), which is the energy currency of the cell.

2. **Identifying the Process**: The first stage of cellular respiration is known as glycolysis. During glycolysis, glucose, a common organic substrate, is converted into pyruvate.

3. **Location of Glycolysis**: Glycolysis occurs in the cytoplasm of the cell. This is a crucial detail because it indicates where the initial steps of cellular respiration take place.

4. **Eliminating Incorrect Options**: The other options provided (carbohydrates, nucleic acid, organic acid) are not locations where cellular respiration begins. Instead, they are types of organic substances or molecules involved in various metabolic processes.

5. **Conclusion**: Therefore, the correct answer to the question "Cellular respiration first begins in" is the cytoplasm.

**Final Answer**: Cellular respiration first begins in the cytoplasm.

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