What is the number of amino acids in an insulin molecule?
Correct answer: C. 51
- A. 21
- B. 45
- C. 51
- D. 66
Explanation
Insulin is a protein hormone composed of 51 amino acids in two chains: the A chain with 21 amino acids and the B chain with 30 amino acids. Option A (21) only includes the A chain, while Option B (45) is close but does not account for the entirety of both chains. Option D (66) overestimates the number of amino acids. Therefore, the correct answer is Option C (51).
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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