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  4. Which of these statements about protein synthesis are NOT correct? I. During transcription, mRNA is synthesized from DNA nucleotides to have the same sequence of nucleotides as the DNA strand on which it was made. II. During transcription, tRNA is synthesized from RNA nucleotides and carries codons that are complementary to the sequence of nucleotides on the DNA strand on which it was made. III. During translation, mRNA is synthesized from RNA nucleotides to have the complementary sequence of nucleotides to that of the DNA strand on which it was made. IV. During translation, ribosomes move on mRNA from 5' to 3', one codon at a time. This is called translocation

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Q. Which of these statements about protein synthesis are NOT correct?
I. During transcription, mRNA is synthesized from DNA nucleotides to have the same sequence of nucleotides as the DNA strand on which it was made.
II. During transcription, tRNA is synthesized from RNA nucleotides and carries codons that are complementary to the sequence of nucleotides on the DNA strand on which it was made.
III. During translation, mRNA is synthesized from RNA nucleotides to have the complementary sequence of nucleotides to that of the DNA strand on which it was made.
IV. During translation, ribosomes move on mRNA from 5' to 3', one codon at a time. This is called translocation

NTA AbhyasNTA Abhyas 2020Molecular Basis of Inheritance

Solution:

During, transcription, mRNA is synthesised and carries the codon that are complementary to the sequence of nucleotides on the DNA strand (anti-sense) on which it was made. Translation refers to the process of polymerisation of amino acids to form a polypeptide. The order and sequence of amino acids are defined by the sequence of bases in the mRNA. Complexes composed of an amino acid linked to tRNA, sequentially bind to the appropriate codon in mRNA by forming complementary base pairs with the tRNA anticodon. Ribosomes move over the mRNA move from 5' to 3', one codon at a time. This is called translocation.