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Molecular Basis of Inheritance Test - 60

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Molecular Basis of Inheritance Test - 60
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Weekly Quiz Competition
  • Question 1
    1 / -0
    One turn of DNA possesses
  • Question 2
    1 / -0
    Watson and Crick were awarded Nobel Prize for their finding of
    Solution
    Nucleic acids were first discovered by Fredrick Meischer in the nuclei of pus cells. Double helical structure of DNA was proposed by Watson and Crick. DNA and RNA are the chain of polynucleotide which are joined by the phosphodiester bonds. The two nucleotide is linked by the phosphodiester bond. It is formed by the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another. The two strands are antiparallel as one runs in 5'-3' direction as the 3' end of sugar is attached to the phosphorous and the other strand is complimentary which runs in 3'-5' direction where 5' end of sugar is attached to the phosphorous.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    Leading strand during DNA replication is formed
  • Question 4
    1 / -0
    New strand formation on a DNA template can be initiated only by ________________.
  • Question 5
    1 / -0
    In Streptococcus pneumoniae
  • Question 6
    1 / -0
    Griffith effect is
  • Question 7
    1 / -0

    Escherichia coli with completely radioactive DNA was allowed to replicate in nonradioactive medium for two generations. Percentage of bacteria with radioactive DNA is

    Solution
    DNA replication is semi-conservative which means that when a new double-stranded DNA molecule is formed one strand will be from the original template molecule and another strand will be newly synthesised. 
    When Escherichia coli with completely radioactive DNA is allowed to replicate in nonradioactive medium, with each generation one strand will remain as such radioactive while new one synthesised will be nonradioactive.
    After the first generation, both the bacteria formed will have 50% radioactive and 50% radioactive DNA. In the second generation, these strands with mixed composition separate and again replicate in the same manner. The non-radioactive strand replicates and synthesises new radioactive strands. While radioactive strands replicate to form new bacterial cells with the mixed composition of DNA. Now, among 4 bacterial cells, 2 have mixed composition of DNA ( both radioactive and nonradioactive strands ) while 2 cells have purely nonradioactive DNA.
    So, the correct option is '50%'.
  • Question 8
    1 / -0
    GUG specifies amino acid valine. However, when functioning as initiation codon it specifies _____________.
    Solution
    • Start codon indicates where to start the translation. The start codon specifies the amino acid methionine and is denoted by code AUG. 
    • However, if AUG is absent, then GUG acts as a start codon and codes for methionine. So, most polypeptides begin with this amino acid.

    So, option A is correct.
  • Question 9
    1 / -0
    Bacterium in which transformation was first studied is
  • Question 10
    1 / -0
    DNA replication requires
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