Which of the following statements are correct regarding untranslated regions (UTR)?
A. UTR is present only at 5′ end.
B. UTR is required for an efficient translation process.
C. UTR is present at both 5′-end and at 3′-end.
D. These are additional sequences that are not translated.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → B, C and D only
An mRNA carries a translational unit, the part between the start codon (AUG) and the stop codon that codes for a polypeptide. It also has extra stretches before and after this unit. These are the untranslated regions (UTR).
(A) UTR is present only at 5′ end. — Incorrect. UTRs are present at both ends: before the start codon (5′ end) and after the stop codon (3′ end).
(B) UTR is required for an efficient translation process. — Correct. Although they are not translated, the UTRs are needed for efficient translation.
(C) UTR is present at both 5′-end and at 3′-end. — Correct. One lies before the start codon and the other after the stop codon.
(D) These are additional sequences that are not translated. — Correct. They are part of the mRNA but are not translated into amino acids.
NCERT Extract:
DNA Fingerprinting – …
