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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance2 Marks
Question
In an experiment, DNA is treated with a compound which tends to place itself amongst the stacks of nitrogenous base pairs. As a result of this, the distance between two consecutive base increases. from 0.34nm to 0.44nm calculate the length of DNA double helix (which has $2 × 10^9$bp) in the presence of saturating amount of this compound.
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Answer

The length of DNA double helix can be calculated by multiplying the distance between two consecutive base pairs with total number of base pairs.
$ 0.44 \times 10^{-9} \mathrm{~m} \times 2 \times 10^9 \mathrm{bp} $
$ =0.88 \mathrm{~m}$

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