mRNA Structure and UTR Function — NEET Biology
🔥 Predicted for NEET 2027A translational unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon and codes for a polypeptide. An mRNA also has some additional sequences that are not translated and are referred as untranslated regions (UTR). The UTRs are present at both 5'-end (before start codon) and at 3'-end (after stop codon). They are required for efficient translation process.
Adjacent to a frequently-asked paragraph in the same chapter.
6. Choose the correct statements: I. Codons are read from 3′ → 5′ direction II. AUG is both start codon and codes methionine III. UGA is a stop codon IV. Codon usage is species-specific
View solution & NCERT explanation
Correct answer: A — II and III only
Codons are read from 5′ → 3′ and code is universal, not species-specific.
What does NCERT say about translational unit mRNA sequence?
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