Which of the following DNA-binding motifs common to many prokaryotic regulatory proteins is the lac repressor an example of?
A)a homeobox
B)a zinc finger
C)a basic region-leucine finger
D)a helix-turn-helix

Question

Quizplus · Accepted Answer

The lac repressor is an example of a helix-turn-helix DNA-binding motif, commonly found in prokaryotic regulatory proteins. This motif consists of two alpha helices separated by a turn of two to five amino acids, with the first helix recognizing the DNA-binding site and the second helix facing the major groove of the DNA helix.

Which of the Following DNA-Binding Motifs Common to Many Prokaryotic