Methionine, cysteine, tyrosine, glycine, alanine, etc. are different amino acids found in the proteins of living cells. What distinguishes these amino acids?

Location of their-COOH group

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Location of their

N H_{2}

group

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The comparison of their side chain or R-group

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Both (1) and (2)

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Solution

The correct option is C The comparison of their side chain or R-group
In nature, 20 amino acids are present. Amino acids are distinguished on the basis of their structure and the structure of their side chains i.e. R- chains. All the amino acids contain the COOH and NH₂group and only the difference in their side chain make them polar amino acids, non - polar amino acids, and aromatic amino acids.
So, the correct answer is 'The comparison of their side chain or R- group

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