BI110 Lecture Notes - Lecture 19: Acetaldehyde, Superoxide Dismutase, Hydrothermal Vent
Document Summary
Anaerobic respiration: non-oxygen molecules (eg. sulfate, nitrate as electron receptors, 25% less atp than aerobic respiration. Fermentation: endogenous molecules (eg: pyruvate , acetaldehyde) as electron receptors, 93% less atp than aerobic respiration. Although they lack mitochondria, prokaryotes have respiratory electron transport chains, located on internal membranes. Many prokaryotes do aerobic respiration; some prokaryotes use a molecule other than o2 as terminal electron acceptor: possess anaerobic respiration, sulphate, nitrate, and ferric ion are common electron acceptors, undergo chemiosmosis. Chemolithotrophs use inorganic materials such as hydrogen sulfide and produce energy via anaerobic respiration. A deep sea hydrothermal vent and a diverse group of organisms adapted to gaining energy from this unique environment. Every organism does glycolysis no oxygen is involved. If oxygen isn"t present there is no electron acceptor so the etc cant operate because there is no where for those electrons to go and the etc stops ,so all processes will stop. Pyruvate is then used in the process of fermentation.
