Which of the following correctly represents hydrogen bonded pairs in $DNA$?

Who proposed the double-helix structure of $DNA$?

$DNA$ fingerprinting is a technique used to identify individuals by their genetic makeup. It relies on the fact that the sequence of nucleotides in $DNA$ is unique to every individual,except for identical twins. The process involves isolating $DNA$,fragmenting it using restriction enzymes,separating the fragments via gel electrophoresis,and then using probes to visualize specific patterns ($DNA$ profiles). Uses: $1$. Forensic investigations for solving crimes. $2$. Determining paternity or maternity. $3$. Identifying genetic disorders and hereditary diseases.

Which of the following is responsible for hereditary characters?

In $DNA$,the base units are linked by which of the following?

Which substance is not present in nucleic acid?