Khorana and his colleague synthesized an RNA molecule with repeating sequences of U and G bases. The RNA with, UGUGUGUGUGUG produced a tetra-peptide with alternating sequences of cysteine and valine. This proves that codon for cysteine and valine is

UGG, GUU

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UUG, GGU

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UGU, GUG

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GUG, UGU

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Solution

The correct option is C UGU, GUG
mRNA molecules have the sequence of nucleotides . The three nucleotides together on m RNA is known as codon which codes for particular amino acids. The RNA has the sequence of UGUGUGUGUGUG that codes for tetrapeptides which contain only cysteine and valine. Thus the codons UGU and GUG codes for cysteine and valine respectively. Thus, the correct answer is option C.

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