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Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
almost 7 years ago
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| Question | Answer |
| What are phototrophs? | Organisms that perform photosynthesis |
| What is common of these organisms? | That they're also autotrophs, by using CO2 to make organic compounds |
| Draw a diagram showing oxygenic photosynthesis by photolithotrophy | Algae + Green plants |
| Draw a diagram showing anoxygenic photosynthesis by photolithotrophy | Purple + Green bacteria |
| What are chemoorganotrophs? | Have many organic sources [O] of organic compounds release energy, stored as ATP Can be aerobic/anaerobic/facultative |
| What are chemolithotrophs? | [O] inorganic compounds Sulphur bacteria Iron bacteria |
| What are the benefits of chemolithotrophs? | No competition for food sources from chemoorganotrophs Many COT waste products can be used by CLTs Close association of the two are common |
| Draw a table showing the feeding habits of chemoorganotrophic and chemolithotrophic organisms | bah |
| What is the Nitrogen Fixation reaction? | N2+8H*+8e-+16ATP -> 2NH3 + H2 + 16ADP + 16 Pi |
| Can Eukaryotic organisms fix nitrogen? | No |
| Draw the nitrogen cycle | n2->NH3->NO2-/NO3- |
| How do nitrogen fixing bacteria occur? (2) | Either free living aerobic/anaerobic or in symbiosis with a root nodule |
| What does Nitrogenase consist of? | 2 Distinct proteins, Dinitrogenase which contains Fe +Mb Dinitrogenase Reductase which contains Fe |
| What is the nitrification reaction? | [O] Nitrosomes: NH4+ + 3O2 -> 2NO2- + 4H* + 2H2O + Energy Nitrobacter: 2NO2- + O2 -> 2NO3- + Energy Overall: NH4+ -> NO2- -> NO3- |
| What is humus? | Complex mix of organic compounds that have resisted rapid decomposition, derived mainly from plants and microorganisms. |
| What is the role of microorganisms in the carbon cycle? | Most important contributor of CO2 into the atmosphere Microbes decompose dead organic material and humus |
| What is the denitrification reaction? | NO3- -> N2 anoxic |
| What is the ammonification reaction? | Organic N -> NH4* |
| What is the annamox reaction? | NO2- +NH3 -> 2N2 + H2O Anaerobic ammonium oxidation |
| Draw the nitrogen cycle | bheehehe ghee |
| What is the sulphur oxidation reaction? | H2S -> S -> SO4 2- Aerobic/anerobic |
| Sulfate reduction | anaerobic SO4 2- -> H2S |
| Sulfur reduction | Aerobic S -> H2S |
| Why does S have so many transformations? | Due to varying S oxidation states |
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