The region of the heart called the SA node is significant because ________
a. defects in the structure result in the irregular sounds called heart murmurs
b. it sets the rhythm for heart rate
c. most heart attacks begin there
d. none of the choices
b
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Which of the following statements is true regarding the sexual life cycle of basidiomycetes? Select all correct choices
A. Spore precursor cells undergo meiosis and mitosis to form spores. B. Spore precursor cells only undergo meiosis to form spores. C. Spore precursor cells only undergo mitosis to form spores. D. Fruiting bodies are composed of both haploid (1n) and dikaryotic (n+n) cells. E. Fruiting bodies are only composed of dikaryotic cells (n+n).
The stramenopiles are an extremely diverse group of organisms which would appear to have very little in common with one another. The one unifying feature in this group is the presence of ________ at some point in the life cycle.
Fill in the blank(s) with the appropriate word(s).
A male peacock has enormous tail feathers that it uses in mating displays to attract females. While the tail feathers are an
A. The feathers require a lot of energy to produce. B. Bright feathers make males less susceptible to predation. C. The large tail feathers would make it easier to fly. D. The feathers make the male more attractive to other males. E. There are no disadvantages to having large tail feathers.
Side effects that occur in patient tissues while they are on antimicrobial drugs include all of the following, except
A. diarrhea. B. development of resistance to the drug. C. nephrotoxicity. D. deafness. E. hepatotoxicity.