Which protein functions as a hormone?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Biology Mcqsbiology-mcqs
Published
12 Jan 2020
Last updated
28 May 2026

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Explanation

Among the listed proteins, oxytocin is the one that acts as a hormone, regulating various physiological functions. Casein is a milk protein, trypsin is a digestive enzyme, and keratin is a structural protein found in hair and nails.

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