A "zone of inhibition" is associated with which of the following tests used to determine the efficacy of antibiotics?
A) Etest
B) diffusion susceptibility test
C) broth dilution test
D) both the Etest and diffusion susceptibility test
E) both the broth dilution and the MBC tests
D
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Imagine that a Toll-like receptor (TLR) gene has duplicated and mutated, creating a leucine-rich region binding pocket that can now bind to the hemagglutinin protein in the envelope of influenza virus. What do you predict will happen to this novel gene?
A. It will be selected for and over evolutionary time will become an even better receptor for HA protein. B. It will spread from species to species. C. It will undergo VDJ rearrangement. D. It will continue to mutate, perhaps changing to bind other proteins or becoming deleted. 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 TLRs? 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?
A toxic material that has the potential to accumulate in the fat tissue of animals is accidentally released into an ecosystem. Plants and animals in this system include red-tailed hawks, mice, corn, and weasels. Arrange the organisms in order according to the level of toxins that they would be expected to accumulate
What will be an ideal response?
What type of cells secrete antibodies?
A. Antigen-presenting cells B. Memory B cells C. Helper T cells D. Plasma cells E. Cytotoxic T cells
The microtubule behavior in which tubulin adds at the plus end, fluxes through a constant-length microtubule, and comes off the minus end is called
a. an equilibrium state. b. dynamic instability. c. treadmilling. d. recycling. e. directional transport.