Enzyme found in ribosomes which is essential for peptide
bond formation is

Options

A. Aminoacyl tRNA synthetase
B. Peptidyl transferase
C. RNA polymerase
D. Peptidyl hydrolase

Answer

To solve the question regarding the enzyme found in ribosomes that is essential for peptide bond formation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Ribosomes**:
- Ribosomes are composed of two subunits. In prokaryotes, these are the 50S and 30S subunits, while in eukaryotes, they are the 60S and 40S subunits.

2. **Identify the Function of Ribosomes**:
- The primary function of ribosomes is to synthesize proteins by translating messenger RNA (mRNA) into polypeptide chains.

3. **Focus on Peptide Bond Formation**:
- During protein synthesis, ribosomes facilitate the formation of peptide bonds between amino acids, which are the building blocks of proteins.

4. **Identify the Enzyme Responsible for Peptide Bond Formation**:
- The enzyme that catalyzes the formation of peptide bonds in the ribosome is known as **peptidyl transferase**. This enzyme is located in the larger subunit of the ribosome (60S in eukaryotes and 50S in prokaryotes).

5. **Review the Options Provided**:
- The options given were: amino acid, tRNA synthetase, peptidyl transferase, RNA polymerase, and peptidyl hydrolase. Among these, **peptidyl transferase** is the correct answer as it directly relates to peptide bond formation.

6. **Conclude the Answer**:
- Therefore, the enzyme found in ribosomes that is essential for peptide bond formation is **peptidyl transferase**.

### Final Answer:
**Peptidyl transferase**