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NEETZoologyMolecular Basis of Inheritance

What is the start codon in mRNA that is recognised only by the initiator tRNA?

Options

  1. AUAA
  2. BUAG
  3. CAUG
  4. DAGA

Correct answer

C. AUG

Step-by-step solution

A translational unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon and codes for a polypeptide. An mRNA also has some additional sequences that are not translated and are referred to as untranslated regions (UTR). The UTRs are present at both 5' -end (before start codon) and at 3' -end (after stop codon). They are required for an efficient translation process. For initiation, the ribosome binds to the mRNA at the start codon (AUG) that is recognised only by the initiator

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