Which of the following proteins is devoid of a quaternary structure?
A) Myoglobin
B) Keratin
C) Hemoglobin
D) Immunoglobin
E) Collagen
F) Two of these
G) None of these
(See answer below.)
Correct Answer: A) Myoglobin
Explanation:
Myoglobin does not have a quaternary structure because it is a monomeric protein, meaning it consists of a single polypeptide chain. Quaternary structure is defined as the arrangement of two or more separate polypeptide subunits into a functional complex.
Keratin generally exists as dimers or higher-order assemblies.
Hemoglobin is a tetramer composed of two alpha and two beta chains.
Immunoglobulins consist of two heavy and two light chains.
Collagen forms a triple-helix structure made of three polypeptide chains.
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