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Q. Consider the following elements:
  1. Carbon
  2. Hydrogen
  3. Oxygen
  4. Nitrogen
Which of these elements are present in all proteins? (UPSC Prelims 1995)
Answer: 1, 2, 3 & 4
Notes: Proteins are composed of molecules known as amino acids, and each individual amino acid contains four key elements which are: hydrogen, oxygen, nitrogen, and carbon. Some proteins might also contain a fifth element, which is sulfur.
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📌 Question Number: 28 in Chemistry-18-Important Non-Metals in the above course in App.

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