Which of the following would be considered an integral membrane protein? Select all correct choices
A. a protein with its N-terminus in the
cytoplasm and its C-terminus in the
extracellular space
B. a protein attached to a transmembrane
protein via hydrogen bonding
C. a protein attached to a phospholipid via
ionic bonding with the head group of the lipid
molecule
D. a protein capable of diffusing throughout
the cytoplasm of a cell
Answer Key: A
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A physician sends a stool sample to your lab, and wants to know if there are lactose fermenting microbes in the sample. How might you determine if these microbes are present or not from this mixed-microbe specimen?
A. Streak the sample for isolation on Thayer-Martin agar (which contains lactose and particular antibiotics for selectivity). B. Streak the sample for isolation on a blood agar plate (which contains lactose AND red blood cells that enrich the culture for iron). C. Streak the sample for isolation on a MacConkey agar plate (which contains lactose and a pH indicator that turns pink when acid byproducts are present). D. None of the above would work-there's no way to reliably determine this feature from the specimen given.
Body defenses that respond to generalized tissue damage and many common pathogens are referred to as
A) phagocytic. B) antipathogenic responses. C) nonspecific mechanisms. D) lymphomas. E) specific mechanisms.
Stems that coil around surrounding objects for support are
A. always parasitic. B. tendrils. C. stomata. D. rhizomes. E. tubers.
Fungi called Deuteromycetes are not known to reproduce sexually. Nonetheless, most of them are considered members of the ________ on the basis of genetic sequences.
A. Zygomycota B. Basidiomycota C. Ascomycota D. Sporozoa E. Rhizaria