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5.Molecular Basis of Inheritance
medium
Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?
A
$AUG, ACG$ - Start/methionine
B
$UUA, UCA $ - Leucine
C
$GUU, GCU$ - Alanine
D
$UAG, UGA$ - Stop
(AIPMT-2008)
Solution
(d) : $AUG$ codes for methionine and is initiation or start codon which starts the synthesis of polypeptide. $UAA$ (ochre), $UAG$ (amber) and $UGA$ (opal) do not specify any amino acid so they are called termination codons. $CUU, CUC, CUA$ and $CUG$ codes for leucine whereas $GCU, GCC, GCA$ and $GCG$ codes for alanine.
Standard 12
Biology
