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AnsCellProbs1 - 5 This is an open-ended question Possible...

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ANSWERS TO CELL PROBLEMS 1. a. fractionation b. light microscopy c. electron microscopy d. electron microscopy, fractionation e. light, electron microscopy f. fractionation g. electron microscopy, fractionation 2. 1000 cubic µ m; 10 -15 cubic meters; 5 x 10 9 . 3. 3/10 µ m -1 ; 3/100 µ m -1 ; think about the surface-to-volume ratio of different shapes. 4. The vacuole: it confines cytoplasm to the sides of the cell and thus keeps cytoplasm in close contact with the cell surface.
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Unformatted text preview: 5. This is an open-ended question. Possible answers depend on the assumptions you make about the parameters for life. General possibilities: the presence of complex molecules that are unstable under the ambient redox conditions; reproduction in the presence of an energy source (light, food); a heat-destructible catalytic system (but note the problem with the last test in the Viking missions). More Earth-life-specific tests could look for RNA, DNA, proteins....
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