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 can follow these steps:

### Step 1: Identify the types of RNA
The three main types of RNA we need to consider are:
1. Messenger RNA (mRNA)
2. Transfer RNA (tRNA)
3. Ribosomal RNA (rRNA)

### Step 2: Determine the approximate lengths of each type of RNA
- **mRNA**: The length of mRNA typically ranges from **400 to 1200 nucleotides**.
- **tRNA**: The length of tRNA is generally around **76 to 90 nucleotides**.
- **rRNA**: The length of rRNA varies, but it can be around **120 to 5000 nucleotides** depending on the type (for example, 16S rRNA is about 1500 nucleotides).

### Step 3: Compare the lengths of the RNAs
From the lengths identified:
- **mRNA** is the longest, with lengths ranging from 400 to 1200 nucleotides.
- **rRNA** can vary significantly but is generally longer than tRNA.
- **tRNA** is the shortest, with lengths of 76 to 90 nucleotides.

### Step 4: Establish the correct order based on length
Based on the lengths:
1. **mRNA** (longest)
2. **rRNA** (medium length)
3. **tRNA** (shortest)

### Conclusion
The correct order of different RNAs with respect to their lengths is:
**mRNA > rRNA > tRNA**