Myosin is a contractile protein found in muscles that is composed of three pairs of subunits, two heavy chains, and two pairs of two different types of light chains, for a total of six subunits. Myosin contains what level(s) of protein structure?
A) primary only
B) primary and secondary only
C) primary, secondary, and tertiary only
D) primary, secondary, tertiary, and quaternary
Answer: D
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