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NEET2005ChemistryBiomoleculesActual

Which one of the following statements is true for protein synthesis (translation)?

Options

  1. AAmino acids are directly recognized by m -RNA.
  2. BThe third base of the codon is less specific.
  3. COnly one codon codes for an amino acid.
  4. DEvery t -RNA molecule has more than one amino acid attachment.

Correct answer

B. The third base of the codon is less specific.

Step-by-step solution

Genetic code shows degeneracy i.e. occurrence of more than 1 codon per amino acid. All the amino acid except methionine and tryptophan are coded by more than 1 codon. For example, valine is specified by GUU, GUC, GUA, GUG This shows that first two bases are common in all the four codons coding for valine. But the third base can be changed.

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