In the lab you isolate a Chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A. No, light absorbed by xanthophylls is not
used to make ATP or NADPH.
B. No, the xanthophylls prevent the
production of reactive oxygen species.
C. Yes, the xanthophylls prevent the
production of reactive oxygen species.
D. Yes, the heat released by the xanthophylls
would warm up the cells and enhance
photosynthesis.
E. No, mutations never spread in nature.
A
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Pyogenic streptococci usually produce ________-hemolysis when cultured on blood agar.
Fill in the blank(s) with the appropriate word(s).
Solutions containing pure alcohol or water-alcohol mixtures are called aqueous.
a. true b. false
What is the key difference between photoheterotrophs and photoautotrophs?
a. Photoautotrophs only use bacteriochlorophyll; photoheterotrophs only use chlorophyll a. b. Photoheterotrophs produce oxygen as a by-product; photoautotrophs do not. c. Photoheterotrophs use hydrogen sulfide for reducing power; photoautotrophs do not. d. Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.
Early Greek philosophers failed to exploit one of the greatest advantages of methodological naturalism, which is:
a. Explanations can be tested through observation and sometimes manipulation. b. Explanations can shift from supernatural to natural. c. Explanations can be based on fixed laws of nature. d. All of the above. e. B and C.