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Determining length of DNA using known number of deoxyribonucleotide pairs

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Give a) mathematical expression to calculate the number of possible sequences of nucleotide pairs with the usual base pairing, for a molecule of n-deoxyribonucleotide pairs.

b) How would you determine the length of a DNA molecule in micrometers, with a known number of deoxyribonucleotide pairs?

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