In order for the helix-turn-helix motif to bind to DNA, the ________ must fit into the major groove of the DNA.
A) homeotic switches
B) recognition helix
C) operator
D) zinc fingers

Question

Quizplus · Accepted Answer

The recognition helix is the part of the helix-turn-helix motif that directly interacts with the DNA. It fits into the major groove of the DNA and allows the protein to recognize and bind to specific DNA sequences. Homeotic switches and zinc fingers are unrelated protein motifs, and the operator is a DNA sequence that can be bound by a variety of DNA-binding proteins, including those with a helix-turn-helix motif.

In Order for the Helix-Turn-Helix Motif to Bind to DNA