Antivirals that target reverse transcriptase would be used to treat
A. hepatitis C virus.
B. HIV.
C. influenza A virus.
D. herpes zoster virus.
E. respiratory syncytial virus.
Answer: B
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Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids. What is this difference
A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly. B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants. C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear. D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome. E) Bacterial plasmids typically do not modify the growth of the host cells; Ti plasmids modified for genetic engineering always produce plant galls.
Whereas the Embden-Meyerhof pathway produces two molecules of pyruvate (net) for each glucose, the Entner-Doudoroff pathway produces one molecule each of ________ and ________.
What will be an ideal response?
Which of the following can stimulate a reactivation of the virus that causes cold sores?
A. Ultraviolet light B. Physical stress (fever, cold winds, trauma, hormonal changes) C. Emotional stress D. All of the choices are correct.
If you could take a time machine back to the Carboniferous period, which of the following would you most likely encounter?
a. Creeping mats of low-growing bryophytes b Fields of tall grasses swaying in the wind c. Swampy forests dominated by tree lycophytes, horsetails, and ferns d. Huge forests of naked-seed trees filling the air with pollen e. The dominance of flowering plants