What does 'R' in EcoRl represent?

Options

A. gene
B. species of prokaryotic cell
C. strain R-245
D. strain RY - 13

Answer

### Step-by-Step Solution:

1. **Understanding EcoR1**: EcoR1 is a type of restriction enzyme, which is a protein that can cut DNA at specific sequences. The name "EcoR1" is derived from the organism from which it was isolated.

2. **Breaking Down the Name**: The name "EcoR1" can be broken down into three parts:
- "Eco" refers to the genus of the organism, which is *Escherichia* (specifically *E. coli*).
- "R" represents the specific strain of the organism from which the enzyme was isolated.
- "1" is a Roman numeral indicating that this is the first enzyme isolated from that strain.

3. **Identifying the Meaning of 'R'**: In the context of EcoR1, the 'R' stands for the specific strain of *E. coli* from which the enzyme was derived. In this case, it refers to the strain RY13.

4. **Conclusion**: Therefore, the 'R' in EcoR1 represents the name of the strain of the *E. coli* bacteria, specifically the strain RY13.

### Final Answer:
The 'R' in EcoR1 represents the name of the strain of *E. coli* from which the enzyme is isolated, specifically strain RY13.

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