Module 9: Carbon Cycle

• label the carbon fixation pathways

  A) methanotrophs

  B) autotrophs

  
• autotrophic microbes require ATP and reducing power for carbon function
• examples of photoautotrophs: cyanobacteria, green sulfur bacteria, and green non-sulfur bacteria
• examples of chemolithoautotrophs: nitrifiers, hydrogen oxidizers and sulfur oxidizers
• reductive acetyl-coA pathways: THF co-enzyme and carbon monoxide dehydrogenase reduce CO2
• reductive acetyl-coA pathway uses H2 as reducing power and ATP to drive acetyl-coa synthase complex
• methanotrophs: proteobacteria that grow by aerobic respiration, oxidize methane as electron donors
• methane monooxygenase oxidizes methane to methanol, produces NADH to drive e- transport
• nitrite-dependent anaerobic methane oxidation uses methane as carbon and energy source, nitrite as e- acceptor