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Capping and Tailing

How is the tr...

Question

How is the translation of mRNA terminated? Explain.

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Solution

Translation of mRNA is terminated when a stop codon (UAA, UAG, UGA) occupy A site of ribosome. Stop codons are not recognised by tRNAs and thus a release factor (RF) protein binds to the complex and hydrolyses the bond between last tRNA and amino acid. So, newly synthesised polypeptide is released and ribosome-mRNA complex dissociates.

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Q. The mRNA is 336 nucleotides long, includes initiator and terminator codon. The number of amino acids in the polypeptide translated from this mRNA is

m R N A, t R N A

and ribosomes help in the process of translation?

Q. In mRNA, AUG is the initiation codon and UAA, UAG and UGA are termination codons, therefore polypeptide cannot be synthesized beyond any of these triplets to the end of mRNA. Then which one of the following mRNA can be translated completely?

Which of the following is the site of translation of mRNA?

Q. Assertion :Hn

m R N A

m R N A

R N A

has no translating introns and has more exons than required for translation.

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BIOLOGY

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Capping and Tailing

Standard XII Biology

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