Hemoglobin is a protein composed of two pairs of polypeptide chains.What is the highest level of protein structure represented in hemoglobin?
A) primary
B) secondary
C) tertiary
D) quaternary
E) molecular

Question

Quizplus · Accepted Answer

Amino acids joined together by peptide bonds constitute the primary level of protein structure. In secondary structure, hydrogen bonding between amino acids causes the polypeptide to form an alpha helix or a beta pleated sheet. In tertiary structure, interactions such as covalent bonds between R groups cause the polypeptide to fold and twist. When two or more polypeptides join together, this represents a quaternary level of structure. There is no level of protein structure termed the molecular level.

Hemoglobin Is a Protein Composed of Two Pairs of Polypeptide