$DNA$ differs from $RNA$ in:

$DNA$ consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is $AGCTTCGA$,then the nucleotide sequence in the other chain shall be:

$A$ $DNA$ fragment contains $3.2$ kilobases $(kb)$. If the $DNA$ fragment contains $820$ adenine molecules,calculate the number of cytosine molecules.

What is the number of $H$-bonds in a $DNA$ fragment containing only $10$ thymine bases?

If the base sequence of one strand of $DNA$ is known,the sequence of bases in the other strand is determined based on:

Nucleotides are linked by