Q. Which of the following elements is always present in proteins?

(A) Carbon, Hydrogen, Oxygen, and Nitrogen
(B) Carbon, Hydrogen, and Oxygen only
(C) Carbon and Hydrogen only
(D) Carbon, Hydrogen, Oxygen, and Phosphorus

✅ Correct Answer: (A) Carbon, Hydrogen, Oxygen, and Nitrogen

Explanation: Proteins always contain nitrogen in addition to carbon, hydrogen, and oxygen.

Published by Mr. Dubey ⭐ 111.42K Points at 27-Oct-2025 02:40 pm in Biology

Explanation by: Mr. Dubey

Proteins always contain nitrogen in addition to carbon, hydrogen, and oxygen.

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