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The ratio of adenine to thymine and guan...

The ratio of adenine to thymine and guanine to cytosine is always unity in a DNA molecule.

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According to Erwin Chargaff rule, the ratios between adenine to thymine and guanine to cytosine are constant and equals one.
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Knowledge Check

  • In the DNA molecule

    A
    the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
    B
    there are two strands which run parallel in the 5' `rarr` 3' direction
    C
    the proportion of adenine in relation to thymine varies with the organism
    D
    there are two strands which run antiparallel one in 5' `rarr` 3' direction and other in 3' `rarr`5'

  • In the DNA molecule

    A
    the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
    B
    there are two strands which run parallel in the 5' `rarr` 3' direction
    C
    the proportion of adenine in relation to thymine varies with the organism
    D
    there are two strands which run antiparallel one in 5' `rarr` 3' direction and other in 3' `rarr`5'

  • Structure of a DNA molecule is :

    A
    Linear
    B
    Branched
    C
    Single helix
    D
    Double helix .

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