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Unformatted text preview: NAME(S): ANSWER KEY BIOL120 RECITATION ACTIVITY #7 KEY: Plant Groups/Evolution WINTER 2008 1. You discover a fungus that contains a strange star-shaped organelle not found in any other eukaryotic cell you have seen. On further investigation you find that the organelle possesses a small genome in its interior and is surrounded by two membranes. How might this organelle have arisen? THE ORGANELLE PROBABLY AROSE AS A RESULT OF ENDOSYSMBIOSIS. 2. List at least two additional pieces of evidence could you look for in order to provide additional support for your proposed mechanism. THERE ARE LOTS OF POSSIBILITIES: SIZE OF THE ORGANELLE (SIMILAR TO BACTERIA), COMPOSITION OF THE MEMBRANE, PRESENCE OF RIBOSOMES, SIZE AND STRUCTURE OF RIBOSOMES, AND/OR CIRCULAR DNA. 3. Draw a phylogenetic tree of the following groups: bryophytes, angiosperms, gymnosperms, seedless vascular plants,...
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