MCB 3020 Lecture Notes - Lecture 15: Electron Acceptor, Facultative Anaerobic Organism, Obligate Aerobe
Document Summary
Chapter 7: microbial growth: microbes cannot regulate their internal temperature, enzymes have optimal temperature at which they function optimally, high temperatures may inhibit enzyme functioning and be lethal, organisms exhibit distinct cardinal growth temperatures. Adaptations of thermophiles: protein structure stabilized by a variety of means. E. g. , chaperones: histone-like proteins stabilize dna, membrane stabilized by variety of means. E. g. , more saturated, more branched and higher molecular weight lipids. Oxygen concentration: growth in oxygen correlates with microbes energy conserving metabolic processes and the electron transport chain (etc) and nature of terminal electron acceptor. Grows in presence of atmospheric oxygen (o2) which is 20% o2: obligate aerobe requires o2, anaerobe. Grows in the absence of o2: obligate anaerobe. Usually killed in presence of o2: microaerophiles requires 2 10% o2, facultative anaerobes. Do not require o2 but grow better in its presence: aerotolerant anaerobes.
