Match List-I with List-II (parts of the name of the restriction enzyme EcoRI).
| List-I | List-II |
| A. E | i. First in order of identification |
| B. co | ii. Name of the genus |
| C. R | iii. Name of the species |
| D. I | iv. Name of the strain |
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → A-ii, B-iii, C-iv, D-i
(A) E — this matches (ii) Name of the genus. The first letter of a restriction enzyme’s name comes from the genus; E stands for Escherichia.
(B) co — this matches (iii) Name of the species. The next two letters come from the species; co stands for coli.
(C) R — this matches (iv) Name of the strain. R comes from the strain of the bacterium, RY 13.
(D) I — this matches (i) First in order of identification. The Roman number shows the order in which the enzymes were isolated from that strain; I means it was the first.
NCERT Extract:
Restriction Enzymes – “… The convention for naming these enzymes is the first letter of the name comes from the genus and the second two letters come from the species of the prokaryotic cell from which they were isolated, e.g., EcoRI comes from Escherichia coli RY 13. In EcoRI, the letter ‘R’ is derived from the name of strain. Roman numbers following the names indicate the order in which the enzymes were isolated from that strain of bacteria.”