BOT 2100 Study Guide - Final Guide: Cyanobacteria, Stromatolite, Autotroph
Document Summary
Was anaerobic; it was rich in hydrogen, methane, and ammonia. Lacked o2: this was tested in the urey-miller experiment, where early atmospheric gasses with passed through a chamber of boiling water, creating amino acids and. Later experiments were even able to synthesize nucleotide bases, essential for rna and. Temperature was very high, and lots of excess free energy was present. Appeared in hot, mineral rich deep sea vents. Archaea: have thick cell walls that can withstand a wide range of conditions. Methanogenic bacteria: strictly anaerobic (killed by o2) methane producers that produced methane from atmospheric h and co2. All methanogens use nh4 as a nitrogen source. The increase in methane production by methanogens would have intensified greenhouse gas effect. Plits h(cid:1006) to (cid:272)reate e(cid:374)erg(cid:455) (cid:374)eeded for photos(cid:455)(cid:374)thesis, (cid:271)ut do(cid:374)(cid:859)t release o(cid:454)(cid:455)ge(cid:374). Prokaryotes became autotrophic due to the selective pressure for self-generation of energy, as energy rich compounds diminished (~3. 5 billion years ago).
