Question

Choose the correct option with respect to UAA, UAG, and UGA codons.

• A. These play significant role in active amino acid formation.
• B. These are recognised by protein release factors rather than tRNAs.
• C. These are called opal, ochre and amber respectively.
• D. These code for glycine, valine and phenylalanine respectively.

Answer 1

The correct option is B These are recognised by protein release factors rather than tRNAs.

UAA(ochre), UAG(amber), and UGA(opal) are the termination codons involved in the termination of the polypetide chain synthesis.
These codons are recognised by protein release factors(RF), rather than by tRNAs.
RF-1 recognises the termination codons UAA and UAG.
RF-1 recognises the termination codons UAA and UGA.
The termination codons do not code for amino acids.