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Assertion (A): The process of translatio...

Assertion (A): The process of translation or protein synthesis 'terminates when the A-site of ribosome encounters a termination codon.
Reason (R): A release factor liinds to the stop codon and translation is terminated.

A

Both A and R are true and R is the correct explanation of A

B

Both A-and R are true but R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

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The process of translation or protein synthesis terminates when a particular site of ribosome encounters a termination codon. Name the site.

Assertion (A): During elongation of a polypeptide chain, the amino acid-tRNA complexes, sequentially bind to the A-site of the ribosome. Reason (R): This binding prepared the complex for termination of translation.

Knowledge Check

  • The Following statements describe some of the steps of translation ,br (a)For chain elongation, the presence of catalyst enhances the rate of peptide bond formation.br (b) The process of translation of mRNA to protein begins when both the subunits of ribosome encounter and associate with mRNA.br (c) During chain elongation, the ribosomes moves from codon to codon along the mRNA. The correct statements are

    A
    (a) and (b)
    B
    (b) and (c)
    C
    (a) and (c)
    D
    (a). (b) and (c)
  • Assertion (A): Some codons act as terminating or stop codons. Reason ( R): 3 codons do not code for any amino acids.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true but R is not the correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true
  • Assertion :- UGG is a chain termination codon. Reason : It does not code any amino acid.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is Flase.
    D
    If both Assertion & Reason are false.
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    The codons causing chain termination (stop codons) are

    Termination of chain growth in protein synthesis is brought about by the codons

    Assertion : Untranslated regions are sequences of RNA before initiation codon and after termination codon. Reason : Untranslated regions provide stability to mRNA and also increase translational efficiency.

    Synthesis of polypetide terminates when a nonsense codon of mRNA reaches

    Assertion (A) : Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason (R ) : m-RNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.