Which of the following statement is correct regarding ribosomes ?

Options

A. Most of a cell's DNA molecule are stored there.
B. Complete polypeptide is released from there
C. mRNAs are produced there
D. DNA replication takes place there

Answer

To determine the correct statement regarding ribosomes, let's analyze each option step by step:

1. **Understanding Ribosomes**: Ribosomes are cellular structures that play a crucial role in protein synthesis. They are found in the cytoplasm and are composed of two subunits (large and small).

2. **Evaluating the Options**:
- **Option A**: "Most of a cell's DNA molecules are stored there."
- This statement is incorrect because the majority of a cell's DNA is stored in the nucleus, not in ribosomes.

- **Option B**: "Complete polypeptide is released from there."
- This statement is correct. Ribosomes are the sites where polypeptides (proteins) are synthesized during the process of translation. The complete polypeptide chain is indeed released from the ribosome once synthesis is complete.

- **Option C**: "mRNAs are produced there."
- This statement is incorrect. mRNA (messenger RNA) is synthesized in the nucleus during transcription, not in the ribosomes.

- **Option D**: "DNA replication takes place there."
- This statement is also incorrect. DNA replication occurs in the nucleus, not in the ribosomes.

3. **Conclusion**: After evaluating all the options, the correct statement regarding ribosomes is that "complete polypeptide is released from there." Therefore, the correct answer is **Option B**.