How are nucleotides linked together in nucleic acids?

Which of the following statements about the assembly of nucleotides in a molecule of deoxyribose nucleic acid $(DNA)$ is correct?

If one strand of $DNA$ has the sequence $ATCGTATG$,the sequence in the complementary strand would be

$A$ gene is a segment of a molecule of

The correct statement with regard to the secondary structure of $DNA$/$RNA$ is:

Which of the following pyrimidine base is present in $RNA$?