Question

the most common dna - binding motif is the multiple choice zinc finger. leucine zipper. nonhelical zipper. helix - turn - helix. homeodomain.

Explanation:

The helix - turn - helix is one of the most common DNA - binding motifs. It consists of two alpha - helices connected by a short peptide turn. Proteins with this motif can bind to DNA and regulate gene expression. Zinc finger, leucine zipper, nonhelical zipper and homeodomain are also DNA - binding motifs but are not as common as helix - turn - helix.

Answer:

D. helix - turn - helix