Which is NOT true regarding plaque assays?
a. Viral titers are expressed as plaque-forming units (PFU).
b. Top agar containing a dilution of virions and bacteria is poured on an agar plate.
c. Plaques are clear zones seen because viruses lysed the host cells in the area.
d. Plaque assays are used to quantify lysogenic phages as well as lytic phages.
Answer: D
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Which muscle fiber type is most fatigable?
A. Slow-twitch (Type I) B. Fast-twitch (Type IIb) C. Fast-twitch (Type IIa)
How could you improve your experiment?
A. Apply the hormone to mouse cell culture. B. Apply the hormone at a concentration of 0.5M. C. Hydrolyze the hormone before application. D. Add ATP as a cofactor. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about hormones? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Polyunsaturated fats ____
a. have fewer hydrogen atoms than do saturated fats b. are more characteristic of animal fats than plant fats c. have no double bonds d. are solid at room temperature e. are gas at room temperature
Which phase of Clostridium botulinum produces botulin?
A) Endospores B) Vegetative cells