Correct answer is option (1), because ' X ' in the given diagram is ori while ' Y ' is rop. ' X ' which is ori is responsible for controlling the copy number of the linked DNA and ' Y which is rop codes for protein involved in the replication of plasmid. Options (2), (3) and (4) are incorrect as ' X ' and ' Y ' are not related to these functions.
NEET UG 2024 — Zoology Biotechnology - Principles and Processes
2024mcqmedium
The following diagram showing restriction sites in E. coli cloning vector pBR322. Find the role of ' X and ' Y genes: 
Official previous-year question
Held on 30 Apr 2024 · Verified 9 Jul 2026.
Options
- A
The gene ' X ' is responsible for controlling the copy number of the linked DNA and ' Y ' for protein involved in the replication of Plasmid.
- B
The gene ' X ' is for protein involved in replication of Plasmid and ' Y ' for resistance to antibiotics.
- C
Gene ' X ' is responsible for recognitions sites and ' Y 's responsible for antibiotic resistance.
- D
The gene ' X ' is responsible for resistance to antibiotics and ' Y ' for protein involved in the replication of Plasmid.
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