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Assertion $(S)$: $DNA$ structure contains $A-T$ complementary base pairing.
Reason $(R)$: $DNA$ structure does not contain uracil.

Franklin and Wilkins showed that $DNA$:

Select the correct statement from the following.

What is the length of one full turn of the helix in $\beta-DNA$ (in $, nm$)?

At which position does the phosphate group attach to the pentose sugar in a nucleotide?

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