Many DNA binding proteins, including the CAP and lac repressor, contain a(n) ________ in their structure.
A) pair of β strands
B) helix-turn-helix motif
C) zinc finger motif
D) extensive β-barrel
E) None of the answers is correct.

Question

Quizplus · Accepted Answer

The helix-turn-helix motif is a common structural motif in DNA binding proteins, including the CAP (catabolite activator protein) and lac repressor, which allows these proteins to bind specifically to DNA sequences.

Many DNA Binding Proteins, Including the CAP and Lac Repressor