Both DNA and RNA are synthesized by covalently linking a nuc

Both DNA and RNA are synthesized by covalently linking a nucleoside triphosphate to the previous nucleotide, constantly adding to a growing chain In the case of DNA, the new strand becomes part of a stable helix. The two strands are complementary in sequence and antiparallel in directionality. What is the principal force that holds these two strands together? What is the complementary law?

Solution

The principal force or bonds between those two strands are Hydrogen bonds between the nitrogen bases.

Adenine always binds with Thymine whereas Guanine always binds with cytosine. This is called as complementary law.