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MIP 300 Lecture Notes - Heterotroph, Covalent Bond, Light-Dependent Reactions

Microbio, Immun, Pathology
Course Code
MIP 300
Erica Suchman

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11 March
Oxidation of inorganic molecules – chemolithotrophic autotrophs
Very few species are chemolithotrophs
Each species has a very specific set of inorganic e- donors and inorganic e- acceptors
Most common acceptors: O2 (aerobic), SO42-, NO3- (anaerobic)
Donors: H2, NO2-, NH4+, S0, Fe2+
Energy is gained when e- are passed from donors (more –E0) to acceptors (more +E0):
process called chemolithotrophy
Energy derived from oxidation of inorganic molecules is used to fix CO2
Energy derived from oxidation of inorganic molecules is very low, must use a great deal
of both e- donors and acceptors, large impact on environment
Photolithotrophic autotrophs – photosynthesis
Capture sunlight energy, convert it into ATP and NADPH
ATP and NADPH used to “fix CO2” into organic molecules, e.g. glucose
O2 is produced
Very important in the ecology of the earth
Provides organic molecules used by heterotrophs
Microbes provide >50% of O2
2 reactions of photosynthesis
Light reactions – light energy is trapped, converted into chemical energy
Dark reactions – energy is used to fix CO2 into organic molecules
Light reactions (plants, algae, some bacteria)
2 pathways – cyclic and non-cyclic photophosphorylation
Light is trapped by pigments which absorb light – chlorophylls
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