A superinfection results from
A. decrease in most normal flora with overgrowth of an unaffected species.
B. build up of a drug to toxic levels in the patient.
C. an immune system reaction to the drug.
D. the wrong drug administered to the patient.
E. All of these choices are correct.
Answer: A
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Heterotrophic bacteria are able to break down large food items
a. by ingesting them with pseudopods. b. with exoenzymes. c. by breaking them up with cilia. d. by crushing with their larger relative size. e. by using their cell membranes to pinch the food into smaller pieces.
In liverworts, what is the gemma cup?
a. fat-knoblike structure that attaches the sporophyte to the gametophyte b. small, broken piece of leaf fragments by which liverworts asexually reproduce c. fibrous, anchoring hair on the underside of the thallus d. the liverwort female gametophyte
Electron microscopes have a much higher resolution than either the human eye or any light microscopebecause:a
of their higher magnification. b. the lenses used are of much higher quality. c. of the very short (nanometer) wavelengths of electrons. d. the images are viewed on screens, rather than directly using an eyepiece or ocular lens. e. it can be used to view stained or living cells.
One of your professors says that fleas jump so high because they have specially adapted leg structures and muscles. But your other professor says that fleas jump high because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. So -- why do fleas jump high?
A. Because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. B. The proximate cause is that they have specially adapted leg structures and muscles, and the ultimate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. C. The ultimate cause is that they have specially adapted leg structures and muscles, and the proximate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. D. Because they have specially adapted leg structures and muscles.