$DNA$ sequences that code for proteins are known as:

Identify the correct matching for Euchromatin and Heterochromatin from the given statements:
$I -$ Loosely packed
$II -$ Densely packed
$III -$ Darkly stained region
$IV -$ Lightly stained region
$V -$ Transcriptionally active chromatin
$VI -$ Transcriptionally inactive chromatin
Euchromatin $\quad\quad$ Heterochromatin

The successive histone octamers in a solenoid fibre are connected by . . . . . . .

The distance between two adjacent base pairs in a $DNA$ double helix is:

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

Genetic mutations occur in: