Which one of following pairs is correctly matched with regard to codon and amino acid coded by it ?

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5.Molecular Basis of Inheritance

medium

Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it ?

$UUA-$ valine

$AM-$ lysine

$AUG-$ cysteine

$CCC-$ alanine

(AIIMS-2004) (AIIMS-2008)

Solution

Valine is one of $20$ proteogenic amino acids. Its codons are $GUU,\,GUC,\,GUA$, and $GUG$. Cysteine codons are $UGU$ and $UGC$. With a thiol side chain, cysteine is classified as a hydrophilic amino acid. Alanine codons are $GCU,\,GCC,\,GCA$, and $GCG$. It is classified as a non-polar amino acid. $L-$ alanine is second only to leucine. Lysine codons are $AAA$ and $AAG$. Lysine is a base, as are arginine and histidine.

Standard 12

Biology