Choose the correct answer from the alternatives given :
Direction : Read the sequence of nucleotides in the given segment of mRNA and the respective amino acid sequence in the polypeptide chain to answer the Q. nos. 65 and 66.
mRNA $A U G U U U A U G C C U G U U U C U U A A \to$
Polypeptide Met-Phe-Met-Pro-Val-Ser
Which codons respectively code for proline and valine amino acids in the given polypeptide chain, respectively?

CCU and GUU

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GUU and UCU

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UCU and UAA

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GUU and CCU

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Solution

The correct option is C CCU and GUU
A codon is a sequence of three nucleotides on an mRNA strand that encodes a specific amino acid.
Sixty-four different three nucleotide combinations (codons) can be made using the four nucleotides in mRNA (43 = 64 combinations).
Following are the codons that represent Valine and proline respectively.
Valine: GUA, GUC, GUG, GUU
proline: CCT, CCC, CCA, CCG

So the answer is ' CCU and GUU'.

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