Macrophages
A. spread throughout the body of animals and take up residence in specific tissues.
B. are derived from monocytes.
C. have receptors for compounds released by the immune system that coat microorganisms and enhance phagocytosis.
D. All of the choices are correct.
Answer: D
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Influenza pandemics occur cyclically because
A) less than 100% of the population is immunized. B) new strains emerge due to reassortment between bird, swine, and human variants. C) the vector is seasonal. D) there are environmental reservoirs that release the virus during particular seasons.
[Knowledge; Easy] The covalent modification most critical to the insulin signaling pathway is:
A. phosphorylation. B. methylation. C. acetylation. D. ubiquitination.
Which of the following is not an example of artificial selection?
A. different varieties of roses; yellow, pink, red, thornless, climbing, etc. B. different breeds of cats; Siamese, Persian, Himalayan, American shorthair, etc. C. different types of tomatoes; roma, beefsteak, grape, cherry, etc. D. different styles of potatoes; fried, mashed, baked, etc. E. different breeds of dogs; poodle, basset hound, Chihuahua, Great Dane, etc.
Regular endurance exercise reduces the risk of type 2 diabetes by