chemotrophs

1. chemotrophs • Chemotrophs are organism that obtain energy by the oxidation of electron donating molecules in their enviroments.these molecules may be organic (organotrophs) or inorganic molecules(lithotrophs). • It is two types: chemoautotrophs • chemoheterotrophs

2. chemoautotrophs • Chemoautotrophs generally use only inorganic energy sources. • Synthesize all necessary organic energy compounds from carbondioxide. • Chemotrophs generally falls in several groups :methanogen, halophiles , sulphur reducers , nitrifiers , anammoxbacteria, and thermoacidophiles.

3. chemoheterptrophs • Must ingest organic building blocks that they are capable of creating on their own . Most chemoheterotrophs derive energy from organic molecules like glucose.

4. Heterotrophs • A heterotroph is a an organism that uses organic carbon for growth . This contrast with autotrophs , such plants which able to directly use source of energy , such as light to produce organic substrate from inorganic carbondioxide . • Herterotrophs are known as consumers in food chain . All animals are heterotrophs.

5. Types of heterotrophs • 1) Phototrophs : obtain energy from light , but needs carbon in an organic form for growth . • 2) Chemoheterotrophs – need an organic source of carbon for both energy source and growth.

6. Organotrophs and lithotrophs • These terma are refers to the chemical that are involved in biosynthesis process or respiration. Phototrophs and chemotrophs can be either lithotrophs or organotrophic.

7. Photoheterotrophs • Organism that use light for energy , use organic compounds from the environment to satisfy their carbon requirements. They use carbohydrates , fatty acid , and alcohols as their food organic “ food”. E.g purple non sulphur bacteria , green non sulphur bacteria and helicobacteria.