Which one of the following is proteinaceous in chemical nature?
A
oxytocin
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B
Estrogen
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C
Progesterone
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D
Testosterone
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Solution
The correct option is B oxytocin The oxytocin is a G protein coupled receptor which requires Mg2+ and cholesterol. It belongs to the rhodopsin-type group of G protein coupled receptors. The peripheral actions of oxytocin mainly reflect secretion from the pituitary gland. Chemical nature of oxytocin is proteinaceous . So the correct answer is 'Oxytocin'