Calcium-Binding Proteins All Possess 2 or More Characteristic Peptide Domains

Multiple Choice

Calcium-binding proteins all possess 2 or more characteristic peptide domains for Ca²⁺ binding that consist of a short a-helix,a loop of 12 amino acids,and a second a-helix (helix-loop-helix) .Which of the following motifs best describes these peptide domains?

A) basic region leucine zipper
B) zinc finger
C) EF hand
D) beta-beta