2. Sample Papers
  3. KVPY

KVPY Sample Paper KVPY Stream-SX Model Paper-24

  • question_answer
    Consider a gene 25.5kb in length. The regulatory region is 500bp long. The number of exons and introns in a gene are 9 and 8 respectively with the mean size of each being 145bp and 2960 bp respectively. What will be the length of a polypeptide chain synthesised by this gene?

    A)  435

    B) 434

    C) 47        

    D) 2406

    Correct Answer: A

    Solution :

    Length of gene =25.5 kb Since mRNA synthesised from this gene will include only exons, so its length will be equal to the length of exons, i.e.,
    Length of mRNA = Number of exons \[\times \]Length of each exon\[9\times 145bp\]\[=1305bp\]
    Since triplet bases code for one amino acid and last triplet is stop codon, Length of polypeptide synthesised from
    \[\operatorname{mRNA}=\frac{1302}{3}=434\]amino acids


You need to login to perform this action.
You will be redirected in 3 sec spinner