Q74 / 200 · MHT CET - Medical 2026 (25 April Shift 2) · Biology
Match the gene in Column I with its role in Column II.
Column I (Gene) Column II (Role of gene) (A) Structural gene (I) Binding site for repressor (B) Operator gene (II) Codes for repressor (C) Promoter gene (III) Codes for enzyme (D) Regulator gene (IV) Binding site for RNA polymerase
Choose the correct option.
| Column I (Gene) | Column II (Role of gene) |
|---|---|
| (A) Structural gene | (I) Binding site for repressor |
| (B) Operator gene | (II) Codes for repressor |
| (C) Promoter gene | (III) Codes for enzyme |
| (D) Regulator gene | (IV) Binding site for RNA polymerase |
- AA-II, B-III, C-I, D-IV
- BA-III, B-I, C-II, D-IV
- CA-III, B-IV, C-I, D-II
- Correct answerDA-III, B-I, C-IV, D-II
Solution
The structural gene codes for the enzymes required for the metabolic pathway.
The operator gene serves as the binding site for the repressor protein, which regulates the transcription of the structural genes.
The promoter gene is the specific DNA sequence where RNA polymerase binds to initiate transcription.
The regulator gene codes for the repressor protein that binds to the operator region.
Therefore, the correct matching is A-III, B-I, C-IV, D-II.
Answer: A-III, B-I, C-IV, D-II
The operator gene serves as the binding site for the repressor protein, which regulates the transcription of the structural genes.
The promoter gene is the specific DNA sequence where RNA polymerase binds to initiate transcription.
The regulator gene codes for the repressor protein that binds to the operator region.
Therefore, the correct matching is A-III, B-I, C-IV, D-II.
Answer: A-III, B-I, C-IV, D-II
Hence, the correct answer is option: 'D'.