In the black bread mold Rhizopus stolonifer, the two different mating types yield
a. a gametangium.
b. a zygosporangium.
c. two diploid cells.
d. two haploid cells.
Answer: B
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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.
Which of the following is not true of cloning vectors?
A. They can be replicated within an appropriate host. B. They contain at least two replication origins. C. They usually contain multicloning sites or polylinkers. D. All of these choices are correct.
Which of the following best describes how enzymes function?
a. by slowing the rate of some reactions and increasing the rate of other reactions b. by increasing the rate of a reaction c. by adding additional reactants to the system d. by changing the ?G of the reaction
Disulfide bonds within or between proteins form easily in which of the following?
a. Both cytosol and ER b. Neither cytosol nor ER c. Cytosol but not ER d. ER but not cytosol