Modern systematics is based on ________ similarities
Fill in the blank(s) with correct word
molecular
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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.
How do anoxygenic phototrophs benefit from possessing accessory pigments that allow light to be harvested at deeper areas of a fluid environment?
A. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present. B. The cells can use wavelengths of light that havenotbeen absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. C. They don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment. D. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present AND can use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. E. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present, use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid; AND don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment.
Why is sexual reproduction sometimes preferable to asexual reproduction?
a. increased genetic diversity b. fewer raw materials needed c. less energy required d. More than one of these answers is correct.
Plants have special growth tissues called ________.
a) endoderm b) gametangia c) apical meristems d) sporangia