The primary structure of a nucleic acid contains the base sequence $GATGC...$. Which of the following chains is complementary to this sequence?

$A$ nucleotide consists of

Which $C$ atom of ribose sugar (numbered from $1^{\prime}$ to $5^{\prime}$) bonds with the phosphate group to form $AMP$ (in $^{\prime}$)?

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

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 $U$.

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