The $AT/GC$ ratio in human beings is (where $A = \text{adenine}$,$T = \text{thymine}$,$G = \text{guanine}$,$C = \text{cytosine}$)

Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word 'diester' in the name of linkage indicate? Which acid is involved in the formation of this linkage?

Match List $-I$ with List $-II$.

$A$. Adenine	$I$. Uracil structure
$B$. Cytosine	$II$. Thymine structure
$C$. Thymine	$III$. Adenine structure
$D$. Uracil	$IV$. Cytosine structure

Choose the correct answer from the options given below:

Select the correct sequence of True $(T)$ and False $(F)$ statements from the following:
$(i)$ $\text{Pentose sugar} + \text{base} \rightarrow \text{Nucleotide}$
$(ii)$ $\text{Nucleotide} + \text{phosphate} \rightarrow \text{Nucleoside}$
$(iii)$ $DNA$ contains four bases $A$,$G$,$C$ and $T$
$(iv)$ $RNA$ contains four bases $A$,$G$,$C$ and $U$.

What are the positions of $N$ atoms present in the purine ring of nucleic acids?

$A$ nucleotide consists of