Column-I                                        Column-II
I. Operator site                               (A) Binding site for RNA polymerase
II. Promoter site                             (B) Binding site for repressor molecule
III. Structural gene                         (C) Codes for enzyme protein
IV. Regulator gene                          (D) Code for repressor molecules
The correct match is:
(a) I - B, II - A, III - C, IV - D          (b) I - B, II - A, III - D, IV - C
(c) I - D, II - C, III - A, IV - B          (d) I - B, II - C, III - A, IV - D

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