The reason for the double helical structure of $DNA$ is the operation of

Select the correct complementary base pairing in $DNA$.

The variation in $DNA$ among different organisms is due to the sequence of:

Which of the following statements are correct regarding $DNA$?
$(a)$ It is double stranded helically coiled.
$(b)$ The two strands are complementary and anti-parallel.
$(c)$ It has deoxyribose sugar and is acidic in nature.
$(d)$ It has only three nitrogen bases.

The term '$nucleosome$' was coined by '$Oudet$' and '$Ollins$', and '$Ollins$' named such particles '$nu$'. Which histone is absent in the '$nucleosome$' core particle?

How many polynucleotide chains are present in the structure of $DNA$?