Histones are enriched with $-$

Adjacent nucleotides in a polynucleotide chain are joined by

In a $DNA$ molecule,if the base ratio $(A+T)/(G+C)$ is $0.3$ and the amount of $A+T$ nitrogenous bases is $30,000$,what will be the amount of $G+C$ nitrogenous bases in the $DNA$ (in $,000$)?

What is required for the packaging of chromatin at a higher level?

What is the similarity between $DNA$ and $RNA$?

How many hydrogen bonds are found between nitrogen bases in $DNA$ having $50$ nitrogen base pairs with $20$ thymine?