The Following statements describe some of the steps of translation ,br (a)For chain elongation, the presence of catalyst enhances the rate of peptide bond formation.br (b) The process of translation of mRNA to protein begins when both the subunits of ribosome encounter and associate with mRNA.br (c) During chain elongation, the ribosomes moves from codon to codon along the mRNA. The correct statements are

Options

A. (a) and (b)
B. (b) and (c)
C. (a) and (c)
D. (a). (b) and (c)

Answer

To determine which statements about translation are correct, let's analyze each statement step by step.

### Step 1: Analyze Statement A
**Statement A:** "For chain elongation, the presence of catalyst enhances the rate of peptide bond formation."

- During translation, specifically during the elongation phase, peptide bond formation is catalyzed by an enzyme known as peptidyl transferase. This enzyme is part of the ribosomal RNA (rRNA) in the large subunit of the ribosome.
- Since peptidyl transferase acts as a catalyst for peptide bond formation, this statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "The process of translation of mRNA to protein begins when both the subunits of ribosome encounter and associate with mRNA."

- Translation begins when the small ribosomal subunit binds to the mRNA. The large subunit then associates with the small subunit after the initiation complex is formed.
- Therefore, the statement is misleading because it implies that both subunits must be present at the start of translation, which is not accurate. Thus, this statement is **incorrect**.

### Step 3: Analyze Statement C
**Statement C:** "During chain elongation, the ribosomes move from codon to codon along the mRNA."

- During the elongation phase of translation, the ribosome indeed moves along the mRNA, reading the codons one by one. This movement is essential for adding amino acids to the growing polypeptide chain.
- Therefore, this statement is **correct**.

### Conclusion
Based on the analysis:
- **Correct Statements:** A and C
- **Incorrect Statement:** B

### Final Answer
The correct statements are A and C.

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