Which carbon atom of ribose sugar is joined to the nitrogen base to form a nucleoside?

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

Which part of $DNA$ acts as a messenger for the synthesis of proteins?

If one strand of $DNA$ has the sequence $ATGCTTGA$,what would be the sequence of its complementary strand?

$DNA$ 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.

Adenosine is an example of which of the following?