Which of these substances does NOT protect a bacterium from phagocytosis?
A) M protein
B) leukocidin
C) capsule
D) siderophore
Ans: D) siderophore
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Although there are several different types of plasmids they all
A. can confer some kind of selective growth advantage depending on environmental conditions B. can induce a mating phenotype. C. result in horizontal transfer. D. make cells resistant to antibiotics
While chasing colorful marshmallows around your bowl of breakfast cereal with a spoon and contemplating the symptoms of ergot, you overhear a cable news report issue a rare retraction: The patients in the American Southwest previously reported to have been infected with tuberculosis have tested positive for a fungal, not bacterial, infection. Which fungus is most likely responsible?
a. Malassezia furfur (Tinea versicolor) b. Candida albicans (Thrush) c. Coccidioides immitis (Valley Fever) d. Claviceps purpurea (Ergot)
Mutations can be
a. random. b. beneficial. c. lethal. d. heritable. e. all of these.
Answer the following questions true (T) or false (F)
1. When a neuron is resting, it has a higher concentration of Na+ ions inside the cell membrane than outside. 2. The action potential moves across the synaptic cleft as an electrical signal. 3. The parasympathetic division of the autonomic nervous system would be key in preserving an individual who is escaping from a dangerous situation.