Which part of the eye regulates the amount of light that reaches the retina?
a. fovea
b. cornea
c. iris
d. lens
c
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It has been hypothesized that fungi and plants have a mutualistic relationship because plants make sugars available for the fungi's use. What is the best evidence in support of this hypothesis?
A) Fungi survive better when they are associated with plants. B) Radioactively labeled sugars produced by plants eventually show up in the fungi with which they are associated. C) Fungi associated with plants have the ability to undergo photosynthesis and produce their own sugars, while those not associated with plants do not produce their own sugars. D) Radioactive labeling experiments show that plants pass crucial raw materials to the fungus for manufacturing sugars.
Anaerobic fermentation often provides CO2, which can be used by ________ as an electron acceptor for energy
A) acetogens B) methanotrophs C) methanogens D) acetogens and methanogens
Freshwater flatworms have this type of system for osmoregulation.
A. protonephridial B. metanephridial C. osmonephridial D. eunephridial E. isonephridial
Meningitis
a. results when a virus or bacterium crosses the blood-brain barrier. b. is not usually fatal. c. results when cerebrospinal fluid seeps out of the meninges. d. occurs when white matter mixes with gray matter. e. includes all of these characteristics