Peptidyl transferase enzyme is present in the following ribosomal sub-unit in chloroplast.

Options

A. 30S
B. 50S
C. 40S
D. 60S

Answer

To determine the ribosomal sub-unit in chloroplasts where the peptidyl transferase enzyme is present, follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Peptidyl Transferase**:
- Peptidyl transferase is an enzyme that catalyzes the formation of peptide bonds between amino acids during protein synthesis. This process occurs in ribosomes.

2. **Identify the Ribosomal Subunits**:
- Ribosomes consist of two subunits: a larger subunit and a smaller subunit. In prokaryotes, these are referred to as 50S (large) and 30S (small) subunits. In eukaryotes, the sizes are different.

3. **Focus on Chloroplasts**:
- Chloroplasts are organelles found in plant cells and are involved in photosynthesis. They have their own ribosomes, which are similar to prokaryotic ribosomes.

4. **Determine the Size of Chloroplast Ribosomal Subunits**:
- In chloroplasts, the ribosomal subunits are also classified as 50S (larger) and 30S (smaller), similar to prokaryotic ribosomes.

5. **Conclude the Location of Peptidyl Transferase**:
- Since peptidyl transferase is present in the larger ribosomal subunit, and in chloroplasts, this subunit is the 50S subunit, we conclude that the peptidyl transferase enzyme is located in the 50S ribosomal subunit.

### Final Answer:
The peptidyl transferase enzyme is present in the 50S ribosomal subunit in chloroplasts.

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