Who proposed the following statement?
"It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."

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:

The purine bases of $DNA$ are .....

Identify the correct features of $DNA$ from the following statements:
$(i)$ It is made of two polynucleotide chains.
(ii) The backbone is constituted by sugar and phosphate.
(iii) The two chains have anti-parallel polarity.
(iv) The bases in the two strands are linked through $H$-bonds.
$(v)$ Both chains are coiled in a right-handed fashion.

The Feulgen reaction in $DNA$ is observed as a result of:

Which structure contains the coded information required to produce the chemicals necessary for performing parental functions?