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A DNA molecule has higher melting point ...

A DNA molecule has higher melting point having more number of GC pairs than another DNA molecule which has more number of AT pairs. What conclusion can be drawn from this fact?

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The DNA molecule with higher number of GC pairs will have higher melting point than the DNA molecule with higher number of AT pairs (i.e., lower number of GC pairs). This is due to presence of three H-bond in GC base pair as compared to two H-bonds in AT base pair. Hence, stronger hydrogen bonding results in higher melting point of the DNA molecule which has more number of GC pairs.
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Knowledge Check

  • The shape of a molecule which has 3 bond pairs and one lone pair is

    A
    Octahedral
    B
    pyramidal
    C
    Triangular planar
    D
    Tetrahedral

  • Which of the following molecules has more than one lone pair-

    A
    `SO_(2)`
    B
    `XeF_(2)`
    C
    `SiF_(4)`
    D
    `CH_(4)`

  • Which one of the following has larger number of molecules ?

    A
    11 gm `CO_2`
    B
    12 gm `O_2`
    C
    2 gm `H_2`
    D
    21 gm `N_2`

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