All life depends on the availability of usable energy. This energy is released when
(a) organisms convert solar energy into the chemical energy found in food molecules
(b) respiration occurs in the cells of producers and high-energy molecules enter the atmosphere
(c) cells carry out the process of respiration
(d) animal cells synthesize starch and carbon dioxide
Answer: (c) cells carry out the process of respiration
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What technical advance made it possible to crystallize DNA?
What will be an ideal response?
Small doses of ionizing radiation over a long period of time cause less damage because
a. they are too low to affect cells. b. they don't hit as many targets. c. the body has time to repair damaged DNA. d. the radiation is absorbed by macrophages. e. the radiation is absorbed by red blood cells.
Which of the following is an advantage of the direct microscopic count?
A) can readily count organisms that are motile B) can easily distinguish live from dead cells C) requires no incubation time D) sample volume is unknown E) requires a large number of cells
Please choose the correct explanation regarding these tapeworm dimensions—30 feet long, yet extremely thin.
> The thinness of the worms allows maximal absorption of nutrients. > Their segments, called proglottids, are produced at the neck, adding length to the worm. > The male and female worms attach end-to-end during reproduction, making them appear to be longer than they really are. > They are flattened nematodes.