The substance that acts as the connecting link between two generations is:

In $B-DNA$,the rise per base pair would be

What preserves heredity? Which structure is known as the unit of inheritance?

$DNA$ 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:

Which of the following statements is $NOT$ true for $DNA$?

$A$ nucleosome consists of: