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In an amino acid, the carboxyl group and amino group are separated from each other by a single ____________ atom.

(a) nitrogen

(b) sulphur

(c) hydrogen

(d) carbon

The question was posed to me in a national level competition.

My query is from Chemical Basis of Life topic in portion Chemical Basis of Life of Cell Biology

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Correct answer is (d) carbon

Explanation: Proteins are polymers containing amino acids as monomers. There are twenty different types of amino acids, with varying functional groups. Every amino acid has a carboxyl group and an amino group separated by a single carbon atom between them.

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