What is the length of one full turn of a $DNA$ helix?

Thirty percent of the bases in a sample of $DNA$ extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this $DNA$ (in $\%$)?

Find the incorrect match.

Telomerase is an enzyme which is a

If the amount of guanine in $DNA$ is $20 \%$,what is the amount of thymine (in $\%$)?

If the length of $DNA$ in an organism is $2.72 \,mm$,how many base pairs will be present in this organism?