rRNA present in 50 S subunit of ribosome is

Options

A. 23 S
B. 5 S
C. Both A and B
D. 23 S, 5.8 S and 5

Answer

To determine the rRNA present in the 50S subunit of ribosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ribosome Structure**:
- Ribosomes are the sites of protein synthesis and consist of two subunits. In prokaryotes, these subunits are 50S (large) and 30S (small), while in eukaryotes, they are 60S and 40S.

**Hint**: Remember that ribosomes are composed of two subunits, and their sizes differ between prokaryotes and eukaryotes.

2. **Identify Components of the 50S Subunit**:
- The 50S subunit in prokaryotes contains two types of ribosomal RNA (rRNA): 23S rRNA and 5S rRNA.
- The 23S rRNA is approximately 2900 nucleotides long, while the 5S rRNA is about 120 nucleotides long.

**Hint**: Focus on the specific rRNA types associated with the 50S subunit.

3. **Examine the Options Provided**:
- The options given are:
1. 23S
2. 5S
3. Both A and B
4. 23S, 5.8S, and 5

**Hint**: Compare the options with the known components of the 50S subunit.

4. **Determine the Correct Answer**:
- Since the 50S subunit is composed of both 23S rRNA and 5S rRNA, the correct answer is option 3: Both A and B.

**Hint**: Remember that both types of rRNA are present in the 50S subunit, confirming that the answer includes both.

### Final Answer:
The rRNA present in the 50S subunit of ribosomes is both 23S and 5S.