The correct order of different RNAs w.r.t. their lengths is

Options

A. mRNA gt tRNA gt rRNA
B. mRNA gt rRNA gt tRNA
C. tRNA gt rRNA gt mRNA
D. tRNA gt mRNA gt rRNA

Answer

To determine the correct order of different types of RNA with respect to their lengths, we need to look at the approximate lengths of mRNA, tRNA, and rRNA.

### Step-by-Step Solution:

1. **Identify the Length of mRNA**:
- mRNA (messenger RNA) has a length of approximately **400 to 1200 nucleotides**. This makes it the longest type of RNA.

2. **Identify the Length of tRNA**:
- tRNA (transfer RNA) has a length of approximately **76 to 90 nucleotides**. This is significantly shorter than mRNA.

3. **Identify the Length of rRNA**:
- rRNA (ribosomal RNA) has a length of approximately **500 to 3000 nucleotides**. However, the typical range mentioned is around **500 to 3000 nucleotides**, which can vary depending on the type of rRNA.

4. **Compare the Lengths**:
- Based on the lengths identified:
- mRNA: 400 to 1200 nucleotides (Longest)
- rRNA: 500 to 3000 nucleotides (Varies, but can be longer than mRNA)
- tRNA: 76 to 90 nucleotides (Shortest)

5. **Order the RNAs by Length**:
- The order from longest to shortest is:
1. rRNA (500 to 3000 nucleotides)
2. mRNA (400 to 1200 nucleotides)
3. tRNA (76 to 90 nucleotides)

### Final Answer:
The correct order of different RNAs with respect to their lengths is:
1. rRNA
2. mRNA
3. tRNA