Which of the following virulence factors has been associated with Pseudomonas aeruginosa?
A.
Endotoxin A
B.
Exoenzyme S
C.
Pyogenic exotoxin
D.
Endoenzyme T
B.
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A gene created from the fusion of two gene fragments is considered a
A. tumor-suppressor gene. B. proto-oncogene. C. structural gene. D. regulatory gene. E. chimeric gene.
____ factors determine which type of algae species will predominate in tide pools in New England
a. Bottom-up b. Top-up c. Abiotic d. Biological e. Physical
Place the following events in the order in which they occur for chemical synapse transmission
(1) Ca2+ enters axon terminal. (2) Ligand-gated ion channels open in postsynaptic membrane. (3) Neurotransmitter binds to postsynaptic receptor. (4) Action potential reaches axon terminal of presynaptic neuron. (5) Neurotransmitter released by exocytosis.
a. 4, 1, 5, 3, 2 b. 4, 3, 1, 5, 2 c. 4, 5, 1, 3, 2 d. 4, 1, 3, 5, 2 e. 4, 5, 2, 3, 1
Nonpoint source pollutants include
a. fertilizers from lawns. b. pesticides from farm fields. c. soil erosion from construction sites. d. all of the above.