Functional proteins
a. Come from animals only
b. Make up the hair, muscles, tendons, and skin
c. Help the body carry out vital activities
d. Contain only essential amino acids
C
Functional proteins help the body carry out activities vital to life. They include hemoglobin, which moves oxygen through the body; myosin, which functions in muscle contraction; and insulin, which is a hormone involved in the control of glucose metabolism. Functional proteins may come from either plant or animal sources and may contain essential and nonessential amino acids. Response B is also incorrect: structural proteins make up hair, tendons, muscle, and skin.
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