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

Question

Quizplus · Accepted Answer

The described peptide domains match the structure of EF hand motifs, which are known to bind calcium ions. The other motifs listed do not match the described structure of the peptide domains.

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