Question

Read the sequence of the nucleotides in the given segment of mRNA and the respective amino acid sequence in the polypeptide chain. Polypeptide Met–Phe–Met–Pro–Val–Ser

(i) Triplet bases (codons) for (1) Valine (2) Proline,

(ii) Nucleotide sequence of the DNA strand from which this mRNA was transcribed.

(iii) Last codon of this RNA stand for.

The correct answer to the question (i), (ii) and (iii) are

$m$ RNA $\stackrel { \text { Met } } { \text { AUG } } \frac { \text { Phe } } { U U U } \frac { \text { Met } } { A U G } \frac { \text { Pro } } { C C U } \stackrel { \text { Val } } { \text { GUU } } \stackrel { \text { Ser } } { U C U } \xrightarrow { \frac { x } { U A A } }$

• A. (i) Valine. GUU Proline. CCU, (ii) TAC AAA TAC GGA CAAAGAATT, (iii) Stop.
• B. (i) Valine. GGU Proline. CCU, (ii) TAC AAA TAC GGA CAAAGAATT, (iii) Stop.
• C. (i) Valine, GUU Proline. CCC, (ii) TAC AAA TAC GGA CAAAGAATT, (iii) Stop.
• D. (i) Valine. GUU Proline. CCU, (ii) ATG TTT ATG CCT GTT TCT TAA, (iii) Stop.

Answer 1

Answer: (A)

(i) Valine. GUU Proline. CCU, (ii) TAC AAA TAC GGA CAAAGAATT, (iii) Stop.