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The lac repressor has which of the following DNA-binding motif?

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The lac repressor has which of the following DNA-binding motif?

(a) Helix-turn-helix

(b) Zinc finger

(c) Homeodomain

(d) Leucine zipper

I got this question in an international level competition.

I would like to ask this question from Principles of Gene Regulation in section Regulation of Gene Expression and Miscellaneous of Biochemistry

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The correct answer is (a) Helix-turn-helix

To explain I would say: The lac repressor has helix-turn-helix DNA-binding motif.

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