Both DNA and RNA Are Synthesized by Covalently Linking a Nucleoside

question 42

Multiple Choice

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?

• A)ionic interactions
• B)hydrogen bonds
• C)covalent bonds
• D)van der Waals interactions

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