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Molecular Basis...

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  • Question 1
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    The relative percentages of nitrogenous bases of the genetic material isolated from various species (P, Q, R, S and T) are listed in the following table.

    SpeciesAdenineGuanineThymineCytosineUracil
    P$$21$$$$29$$$$21$$$$29$$$$0$$
    Q$$29$$$$21$$$$29$$$$21$$$$0$$
    R$$21$$$$21$$$$29$$$$29$$$$0$$
    S$$21$$$$29$$$$0$$$$29$$$$21$$
    T$$21$$$$29$$$$0$$$$21$$$$29$$

    Choose the correct statement from the following.

  • Question 2
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    The DNA model proposed by Watson and Crick

  • Question 3
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    Choose the correct answer from the alternatives given :
    Watson and Crick (1953) proposed DNA double helix model and won the Nobel Prize; their model of DNA was based on
    (i) X-ray diffraction studies of DNA done by Wilkins and Franklin
    (ii) Chargaffs base equivalence rule
    (iii) Griffiths transformation experiment
    (iv) Meselson and Stahls experiment.

  • Question 4
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    Choose the correct answer from the alternatives given :
    Which of the following figures correctly represents the replication fork formed during DNA  replication?

  • Question 5
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    Choose the correct answer from the alternatives given :
    Other than DNA polymerase, which are the enzymes involved in DNA synthesis?

  • Question 6
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    Choose the correct answer from the alternatives given :
    Which of the following phenomena was experimentally proved by Meselson and Stahl?

  • Question 7
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    If the sequence of bases in DNA is GCTTAGGCAA then the sequence of bases in its transcript will be

  • Question 8
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    Choose the correct answer from the alternatives given :
    The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ________ direction.

  • Question 9
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    DNA replication takes place at ________ phase of the cell cycle

  • Question 10
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    Choose the correct answer from the alternatives given :
    Read the following statements.
    (i) One codon codes for only one amino acid.
    (ii) Some amino acids are coded by more than one codon.
    (iii) The, sequence of triplet nitrogenous bases in DNA or mRNA corresponds to the amino acid sequence in the polypeptide chain.
    Give suitable terms for the characteristics of genetic code as per the above statements.

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