Multiple choice

Which one of the following is the principal structural element of a living cell?

  1. Nitrogen

  2. Carbon

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon is the principal structural element of living cells. It forms the backbone of all organic molecules including carbohydrates, proteins, lipids, and nucleic acids, which are the fundamental building blocks of cellular structure and function.

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