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Question

Which of the following are the most abundant elements in the living cells?
  1. C, O, N and P
  2. C, H, S and P
  3. C, H, O and N
  4. C, H, Mg and Ca

A
C, H, O and N
B
C, O, N and P
C
C, H, Mg and Ca
D
C, H, S and P
Solution
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The correct option is C C, H, O and N
  • The most common elements in living things are carbon, hydrogen, oxygen, nitrogen.
  • A carbohydrate is a biological molecule consisting of carbon (C), hydrogen (H), and oxygen (O) atoms.
  • Proteins are made up of amino acids which are organic compounds that contain an amino group and carboxyl functional groups, along with a side chain (R group) specific to each amino acid.
  • Each nucleotide consists of a nitrogen-containing aromatic base attached to a pentose sugar (C, H, and O), which is in turn attached to a phosphate group.
  • So, major macromolecules consist of C, H, O, and N and hence, are the most abundant elements in living cells.
Thus, the correct answer is option (C).

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