Question

In EcoRI, R and I denote:

• A. Remove nucleotides and cut within DNA
• B. Name of strain and order of enzyme isolated from the strain of bacteria
• C. Restriction endonuclease and number of strain
• D. Name of the scientist and number of bacteria

Hint:

EcoRI: Eco = E. coli, R = strain RY13, I = first enzyme isolated.

Answer 1

The Correct Option is B

The restriction enzyme EcoRI is named as follows:
- Eco: Indicates the genus and species of the source organism, i.e., Escherichia coli.
- R: Refers to the strain of E. coli, in this case RY13.
- I: Indicates that it was the first enzyme isolated from this strain.
So, R and I stand for:
- R = Strain of the bacterium
- I = First enzyme isolated from this strain
Therefore, the correct interpretation is:
Name of strain and order of enzyme isolated from the strain of bacteria

Answer 2

In EcoRI, R and I denote:

EcoRI is a type of restriction enzyme widely used in molecular biology for cutting DNA at specific sequences. The name "EcoRI" follows a standard nomenclature system for naming restriction enzymes.

The first part, "Eco," refers to the genus and species of the bacterium from which the enzyme was originally isolated — in this case, *Escherichia coli*.

The letter "R" denotes the specific strain of the bacterium.

The Roman numeral "I" indicates the order in which this particular enzyme was isolated from that strain.

Therefore, in EcoRI:
- "E" stands for *Escherichia* (genus),
- "co" stands for *coli* (species),
- "R" is the strain designation,
- "I" is the first enzyme isolated from that strain.

Correct Answer: Name of strain and order of enzyme isolated from the strain of bacteria