The two strands of a double helix model of $DNA$ are held together by hydrogen bonds between
sugar and phosphate groups.
sugar and nitrogenous bases.
phosphate groups and nitrogenous bases.
nitrogenous bases.
A nucleoside differs from a nucleotide in not having
A single stranded $DNA $ molecule is the genetic material of bacteriophage
In the $340 A^o$ long $DNA$ strand
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
Retroviruses do not follow central Dogma. Comment