Which is not a category of virulence factors?
A) immune system evasion
B) nutrient acquisition
C) toxins
D) attenuation
E) adhesion
Answer: D
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Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to signal contraction by the muscle cell. B. A cell-surface receptor on the muscle cell is activated by acetylcholine binding. C. Upon activation, the acetylcholine receptor on the neuron undergoes a conformational change to activate an ion channel in the muscle cell. D. An opened ligand-gated ion channel allows sodium ions to rush across the plasma membrane to the inside of the muscle cell. E. A sudden influx of sodium ions across the plasma membrane drastically reduces the membrane potential and activates the contractile machinery of the muscle cell.
The gene pool of the next generation is derived from
A. all individuals of a population. B. only the female members of a population. C. those individuals of a population that reproduce and have viable offspring. D. individuals who are heterozygous for the genes in question. E. only the male members of a population.
The above figure represents
a. individual genes from an asexual worm. b. maternal chromosomes that are identical. c. paternal chromosomes that are identical. d. both maternal and paternal chromosomes. e. none of these.
Theoretically, based on the cohesion-tension mechanism, what should be the maximum height for the tallest trees?
a. about 3 m b. about 50 m c. about 75 m d. about 130 m