The unit of inheritance is.

The length of $DNA$ in $E. coli$ is:

Exposure of an organism to $UV$ radiation causes:

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.

What are the full forms of $mRNA$ and $tRNA$?

In a given $DNA$ segment,the number of nucleotides of guanine is $75$ and those of thymine is $75$. The total number of nucleotides in the segment will be: