Question

The six most common atoms in organic molecules are

• A. C, H, O, He, Ca, and S
• B. C, H, O, N, P, and S
• C. C, H, O, Ca, Mg, and S
• D. C, O, N, S, P, and Mg

Answer 1

The correct option is B

C, H, O, N, P, and S

The correct option is (B):

Explanation of the correct option:

1. The six most common atoms in organic molecules are C, H, O, N, P, and S.
2. These six elements are the most abundant element in cells, thus they are called macronutrients.
3. C, N, O, and H are the most abundant molecules which are required for the production of biomolecules like proteins, lipids etc.
4. Hence they are found abundantly in these molecules.
5. Phosphorous is an important molecule which is necessary for ATP synthesis.
6. Sulphur is the raw material of many biologically important compounds.

Final answer: C, H, O, N, P and S are the most common atoms in organic molecules.