Sedimentation coefficient of mitoribosomes of higher plants is :–

Options

A. 80s
B. 70s
C. 65s
D. 55s

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the sedimentation coefficient of mitoribosomes in higher plants. The sedimentation coefficient is a measure of the rate at which particles settle in a centrifugal field and is expressed in Svedberg units (S).

2. **Reviewing the Options**: The options provided are:
- Option 1: 80S
- Option 2: 70S
- Option 3: 65S
- Option 4: 55S

3. **Analyzing Each Option**:
- **Option 1 (80S)**: This is the sedimentation coefficient for eukaryotic ribosomes, not specifically for mitoribosomes of higher plants. Therefore, this option is incorrect.
- **Option 2 (70S)**: This is the correct sedimentation coefficient for mitoribosomes in higher plants. Mitoribosomes are similar to prokaryotic ribosomes and have a sedimentation coefficient of 70S.
- **Option 3 (65S)**: This option is incorrect as it does not correspond to the sedimentation coefficient of mitoribosomes.
- **Option 4 (55S)**: This option is also incorrect for the same reason as option 3.

4. **Conclusion**: After analyzing all the options, the correct answer is **Option 2: 70S**.

**Final Answer**: The sedimentation coefficient of mitoribosomes of higher plants is 70S.

---