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JIPMER2009ZoologyMolecular Basis of Inheritance

Initiation codon is

Options

  1. AUUU
  2. BUGA
  3. CAUG
  4. DUAG

Correct answer

C. AUG

Step-by-step solution

AUG which codes for methionine (Met) is used as start signal in protein synthesis. It is the most common chain initiation codon. In prokaryotes, the codons GUG and UUG are also employed in instances as start codons. Three triplets, UAA (ochre), UAG (amber) and UGA (opal) do not code for any amino acid and are called non-sense codons. Their function is to terminate the message for gene controlling protein synthesis. Non-sense codons are also called chain termination codons. UUU (uracil) codes for phenylalanine.

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