Most proteins to be used within cytosol (cytoplasm ) are synthesized on

Options

A. free ribosome
B. bound ribosome
C. Golgi bodies
D. nucleus

Answer

**Step-by-Step Solution:**

1. **Understanding Protein Synthesis**: The process of protein synthesis involves the creation of proteins from amino acids, which is primarily carried out by ribosomes.

2. **Identifying Ribosomes**: Ribosomes can be found in two forms:
- Free ribosomes, which float freely in the cytosol (cytoplasm).
- Bound ribosomes, which are attached to the rough endoplasmic reticulum (RER).

3. **Function of Ribosomes**: Both free and bound ribosomes are involved in synthesizing proteins. However, the location of synthesis varies:
- Free ribosomes synthesize proteins that will function within the cytosol.
- Bound ribosomes synthesize proteins that are typically secreted from the cell or incorporated into membranes.

4. **Determining the Majority**: The question specifically asks about the majority of proteins synthesized within the cytosol. Since free ribosomes are responsible for synthesizing proteins that remain in the cytosol, they account for the majority of such proteins.

5. **Conclusion**: Therefore, the answer to the question is that most proteins to be used within the cytosol are synthesized on **free ribosomes**.

**Final Answer**: Most proteins to be used within the cytosol are synthesized on **free ribosomes**.

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