BIOL 4160 Midterm: BIOL 4160 Exams_2006
Document Summary
Photosynthesis (sc/biol 4061) first term test (5 oct 2006) Answer the following five questions in the exam booklet provided. Macrofossil evidence for primordial" photosynthesis is fairly strong, because living stromatolites were recently discovered that are similar in structure to fossil stromatolites. Describe the structure and function of a modern stromatolite and how it relates to changes in atmospheric conditions over the past 3000 million years or so. Prokaryotic photosynthesis is divided into anoxygenic and oxygenic mechanisms. Describe the properties of photosynthesis shared among and/or unique to prokaryotic anoxygenic photosynthesizers (including the nature and properties of the pigments they use and unique mechanism(s) of carbon dioxide fixation). Contrast the two mechanisms of cyclic tetrapyrrole synthesis leading to heme and chlorophyll from the basic precursors. Describe how emerson and arnold established the concept of a group" of chlorophyll molecules participating in oxygen evolution in photosynthesis.
