Which of the following statements about the two paired nucleotide strands of the DNA double helix are correct?
A: The nucleotides that make up one strand of the molecule are joined by hydrogen bonds.
B: A-T basepairs have the same width as G-C basepairs.
C: The G on one strand forms 3 hydrogen bonds with the C on the complementary strand.
D: It is thermodynamically easier to break the bonds between A-T base pairs than between the G-C base pairs.
E: A, B and C.
F: B, C and D
G: C and D
Ans: F: B, C and D
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Acyclovir is an antiviral chemical that resembles a nucleotide but lacks a 3' OH group and cannot form phosphodiester bonds. Why is Acyclovir useful in treating some viral infections?
A. Acyclovir stops viral protein synthesis. B. Acyclovir halts viral DNA replication. C. Acyclovir blocks the assembly of viral cell capsules. D. Acyclovir hydrolyzes viral polysaccharides.
Ultraviolet light damages DNA by causing
A) purine rings. B) strand breaks. C) thymine dimers. D) radioactivity.
Sea otter populations were reduced by overhunting, allowing an overgrowth of one of their prey animals, the ____,
which subsequently consumed and decimated ____.populations.
a. crabs; shrimp b. abalone; algae c. sea urchin; kelp d. harbor seals; fish e. crab; kelp
The endomembrane system did not start developing
until the atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from low oxygen to high oxygen. d. firmly in the age of aerobes. e. all of these.