In the structure of $DNA$,which components are positioned opposite to each other,at an equal distance,and in opposite directions?

What is the length of $DNA$ present in a nucleosome (in $, nm$)?

If one strand of a double-stranded $DNA$ has the sequence $3'-ATTCGTAC-5'$,what will be the sequence of its complementary strand?

State the characteristic feature of $DNA$ in organisms.

The bond between the phosphate and hydroxyl group of sugar is ...........

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