Assertion : UAA,,UAG and UGA terminate protein synthesis. Reason : They are not recognised by tRNA .

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5.Molecular Basis of Inheritance

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Assertion : $UAA,\,UAG$ and $UGA$ terminate protein synthesis.

Reason : They are not recognised by $tRNA$.

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2011) (AIIMS-2014)

Solution

Synthesis of polypeptide terminates when a nonsense codon of $mRNA$ reaches the $A-$ site. There are three nonsense codons-$UAA, \,UAG$ and $UGA$. These codons are not recognised by any of the $tRNAs$. Therefore, no more aminoacyl $tRNA$ reaches the $A$ site. The $P-$ site $tRNA$ is hydrolysed and the completed polypeptide is released in the presence of a release factor.

Standard 12

Biology

A naturally occurring coding strand composed of alternating $C$ and $U$ residues would result in the formation of

medium

Give scientific reasons : Unambiguous, Universal and degenerate are some of the terms used for the genetic code.

easy

Which of the following $RNAs$ picks up specific amino acid $(from\ amino\ acid\ pool)$ in the cytoplasm to ribosome during protein synthesis

medium

(AIPMT-1997)

Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it ?

medium

(AIIMS-2008)

In a cell, protein synthesis occurs by the linking together of amino acids. The base sequence of $mRNA$ defines the primary structure of proteins because

medium

Assertion : $UAA,\,UAG$ and $UGA$ terminate protein synthesis. Reason : They are not recognised by $tRNA$.

Solution

Similar Questions

A naturally occurring coding strand composed of alternating $C$ and $U$ residues would result in the formation of

Give scientific reasons : Unambiguous, Universal and degenerate are some of the terms used for the genetic code.

Which of the following $RNAs$ picks up specific amino acid $(from\ amino\ acid\ pool)$ in the cytoplasm to ribosome during protein synthesis

Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it ?

In a cell, protein synthesis occurs by the linking together of amino acids. The base sequence of $mRNA$ defines the primary structure of proteins because

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Assertion : $UAA,\,UAG$ and $UGA$ terminate protein synthesis.

Reason : They are not recognised by $tRNA$.