70S type of ribosome shows two units whose sedimentation constants are
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Sub unit in prokaryotic ribosome is

Options

A. Sedimentation coefficient
B. Solubility
C. Surface area
D. Size

Answer

### Step-by-Step Solution:

1. **Understanding Ribosomes**: Ribosomes are cellular structures responsible for protein synthesis. They can be classified based on their sedimentation coefficients, which is a measure of how quickly they can be separated by centrifugation.

2. **Identifying Ribosome Types**: In prokaryotes, the ribosomes are referred to as 70S ribosomes. The "S" stands for Svedberg units, which indicate the sedimentation rate.

3. **Subunit Composition of 70S Ribosomes**: The 70S ribosomes in prokaryotes are composed of two subunits:
- The smaller subunit is 30S.
- The larger subunit is 50S.

4. **Sedimentation Coefficients**: The sedimentation coefficients of these subunits are significant because they determine how the ribosomes are classified. The 30S and 50S subunits combine to form the 70S ribosome.

5. **Answering the Question**: The question asks for the characteristic that describes the subunits of prokaryotic ribosomes. The correct answer is the sedimentation coefficient, which is option A.

### Final Answer:
The subunits in prokaryotic ribosomes are characterized by their sedimentation coefficients.