BIO 200 Lecture Notes - Lecture 25: Citric Acid Cycle, Cell Membrane, Chemosynthesis

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200
• Professor: C.Herreid

Document Summary

But some prokaryotes evolved a way to deal with the o2: Oxygen atom + 2 electrons -> o- then o- + 2h -> h2o. Glycolysis, brackets mean aerobic, many anaerobic bacteria can do this. To: little atp produced, co2 released, h2o is formed, loss of atp formed, o2 is final e- receptor. This could only occur after the oxygen revolution. Where did eukaryotes come from: answer: the evolved from prokaryotes. Two hypotheses: in folding hypothesis, plasma membrane goes, in folding of plasma membrane, cell with nucleus and endomembrane system, engulfing of aerobic heterotopic prokaryote, engulfing of photosynthetic prototype (where mitochondria comes in, ancestral photosynthetic eukaryote with plastid. Notice: the mitochondria and chloroplasts enter the cell after the membrane system of the cell has become established: endosymbiotic hypothesis: Eukaryotes have both archaebacteria and eubacteria genes: archaeal genes run processes involving dna and rna (informational functions): replication, transcription, and translation, bacterial genes run metabolic and housekeeping chores.