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MBIO 3401 EXAM 3 2025 QUESTIONS AND ANSWERS In anoxygenic photosynthesis, which compound (or compounds) is (are) used by purple and green bacteria as a source of electrons for the reduction of CO2? ....ANSWER ...-H2O In an ecological sense, the variety of photosynthetic pigments found among different groups of photosynthetic bacteria allows them to: - ....ANSWER ...-avoid direct competition by absorbing different wavelengths of light Rickettsias and Chlamydias are two unrelated groups of bacteria that nevertheless share a unique characteristic. This characteristic is: - ....ANSWER ...-they are both obligate intracellular parasites of eukaryotes what important soil process are these chemolithotrophic bacteria involved in? ....ANSWER ...-nitrification a student in lab inoculates several spread plates of E. coli and then irradiated them with ultraviolet light to determine the rate of cell killing. No decrease was seen in the number of colonies on the irradiated plates compared to the non-irradiated plates. What mistake did this student probably make? - ....ANSWER ...-he left lids on the spread plates and the ultraviolet light was unable to penetrate the plastic barrier ...©️ 2025, ALL RIGHTS RESERVED 1