The conventional method for naming restriction enymes is followed. In case of Eco RI the "R" indiates

Options

A. Genus
B. Species
C. Name of the scientist
D. Strain

Answer

To answer the question regarding what the "R" in Eco RI indicates, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Nomenclature**:
- The naming of restriction enzymes follows a specific convention. The first letter of the name is capitalized and represents the genus of the organism from which the enzyme is derived.

2. **Identifying the Components**:
- In the name Eco RI:
- "E" stands for the genus *Escherichia*.
- "co" represents the species *coli*.
- "R" is the letter we need to analyze further.
- "I" is a Roman numeral indicating the order of discovery of the enzyme.

3. **Determining the Meaning of "R"**:
- The letter "R" specifically indicates the strain of the bacterium from which the enzyme is derived. In this case, it refers to a particular strain of *Escherichia coli*.

4. **Evaluating the Options**:
- Now, we can evaluate the options provided in the question:
- Option 1: Genus - Incorrect, as "E" indicates the genus.
- Option 2: Species - Incorrect, as "co" indicates the species.
- Option 3: Name of Scientist - Incorrect, as the naming convention does not include the name of a scientist.
- Option 4: Strength - Correct, as "R" indicates the strain of the bacterium.

5. **Conclusion**:
- Therefore, the "R" in Eco RI indicates the strain of the bacterium.

### Final Answer:
The "R" in Eco RI indicates the strain of the bacterium.

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