| Column-I (Components of Lac Operon) | Column-II (Function) | ||
| A. | Structural gene | p. | binding site for represser protein |
| B. | Operator gene | q. | codes for represser protein |
| C. | Promoter gene | r. | induces lactose transport from the medium |
| D. | Regulator gene | s. | codes for enzyme proteins |
| t. | binding site for RNA- polymerase |
A) A = q, B = t, C = p, D = r
B) A = r, B = s, C = t, D = p
C) A = s, B = p, C = t, D = q
D) A = t, B = s, C = q, D = p
Correct Answer: C
Solution :
As per the Operon system, structural genes codes for proteins through m-RNA formation. The represser is synthesized through activity of regulator gene. The represser protein attaches on operator gene and checks synthesis of w-RNA. During transcription, RNA polymerase enzyme binds on promoter genes.
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