Adenoviruses are a frequent cause of acute upper respiratory tract infections in humans. Adenoviruses are non-enveloped and their capsid contains a "fiber" protein that is analogous in function to the spike glycoproteins of HIV. Which of the following would be ACCURATE about an adenovirus that has a mutation in its fiber protein gene?
A. The virus would still cause upper respiratory tract infections in humans but at a slower rate.
B. Because it has a defective fiber protein, it will now have a broader host range.
C. It would not be able to cause disease in humans.
D. It would be able to infect humans normally, but would not be able to replicate its genome.
E. It would be able to infect humans normally, but would not be able to release new adenoviruses from the human cells.
C. It would not be able to cause disease in humans.
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When fat enters the duodenum, it stimulates release of which hormone?
a. amylase b. cholecystokinin c. gastrin d. secretin e. trypsin
Most digestion take place in the
a. stomach. b. small intestine. c. large intestine. d. stomach and small intestine equally. e. small and large intestine equally
In which organ does the smooth ER inactivate drugs and harmful metabolic byproducts?
a. brain b. kidney c. liver d. heart e. spleen
If a strong fungicide is released and eliminates all the fungi in an ecosystem, which of the following is likely to happen?
A) Improved growth of plant species B) Increased rate of photosynthesis C) Faster breakdown of leaf litter D) Improved soil fertility E) An accumulation of dead and discarded plant and animal tissues