The α helix and the β pleated sheet are both common polypeptide forms found in which level of protein structure?
A)primary
B)secondary
C)tertiary
D)quaternary
E)all of the above

Question

Quizplus · Accepted Answer

The α helix and β pleated sheet are both secondary structures because they involve the folding of the polypeptide backbone, but not the side chains. This is different from tertiary and quaternary structures, which involve the folding and interactions of the entire protein molecule, including side chains. The primary structure refers to the linear sequence of amino acids in the polypeptide chain. Therefore, the correct answer is B, secondary.

The α Helix and the β Pleated Sheet Are Both