Poriferans are
a. herbivores.
b. filter feeders.
c. scavengers.
d. predators.
e. carnivores.
Answer: b
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Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
Gause's principle of competitive exclusion is based on the idea that ____
a. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbrush b. competition for the same resources excludes species having different life styles. c. no two species can occupy the same niche indefinitely when resources are limited d. two species can coexist if their niches do not overlap e. species survival depends upon coevoloution
In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is
a. the relative solubility of the component. b. the size and weight of the component. c. the percentage of carbohydrates in the component. d. the number of enzymes in the fraction. e. the presence or absence of lipids in the component.
What is a symptom of Cushing's disease?
a. loss of ability to cope with stress b. mild infection c. abnormally large face and hands d. fat deposition around the trunk e. intellectual disability