Many species of bacteria live bound together by a gluelike substance that, among other things, makes up the plaque on human teeth. This is an example of a ____
a. pilus
b. mass
c. vesicle
d. colony
e. biofilm
e
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The process by which sympatric speciation might occur would most likely be the result of:
A. convergent evolution. B. adaptive radiation. C. natural selection. D. vicariance.
The tundra, boreal forest, and tropical savanna are all
A. communities. B. ecosystems. C. food chains. D. biomes.
Which of the following structures protects the delicate gills of many fish?
A) Spiracles B) An operculum C) Lamellae D) Tracheoles E) An alveolus
An agricultural worker experiences difficulty breathing which becomes progressively worse. Tests show inflammation and damage of the lung tissue, but IgE antibodies and granulocytes are in the normal ranges. With which disorder of the immune system are these signs and symptoms consistent?
A) allergic reaction B) type III (immune complex-mediated) hypersensitivity C) type IV (delayed) hypersensitivity D) autoimmunity E) acquired immunodeficiency