19. For the helix in double-stranded B-form DNA, the majority of the stability of the DNA can be attributed to: A. base-pairing interactions via H-bonds. B. interactions along the phosphate backbone. C. base-stacking interactions via van-der-Waals interactions. D. covalent bonds between adjacent bases in one strand. E. ionic interactions with metal ions.

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Chapter1: Chemical Foundations
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please answer both question 19 and 20

19. For the helix in double-stranded B-form DNA, the majority of the stability of the DNA can be
attributed to:
A. base-pairing interactions via H-bonds.
B. interactions along the phosphate backbone.
C. base-stacking interactions via van-der-Waals interactions.
D. covalent bonds between adjacent bases in one strand.
E. ionic interactions with metal ions.
20. In living cells, nucleotides and their derivatives can serve as:
A. carriers of metabolic energy.
B. enzyme cofactors.
C. Intracellular signals.
D. precursors for nucleic acid synthesis.
E. all of the above.
Transcribed Image Text:19. For the helix in double-stranded B-form DNA, the majority of the stability of the DNA can be attributed to: A. base-pairing interactions via H-bonds. B. interactions along the phosphate backbone. C. base-stacking interactions via van-der-Waals interactions. D. covalent bonds between adjacent bases in one strand. E. ionic interactions with metal ions. 20. In living cells, nucleotides and their derivatives can serve as: A. carriers of metabolic energy. B. enzyme cofactors. C. Intracellular signals. D. precursors for nucleic acid synthesis. E. all of the above.
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