BIOA01H3 Chapter Notes - Chapter 22: Antibiotics, Asexual Reproduction, Chromosome

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Including extreme habitats too hostile for most organisms: appear simple in structure compared to eukaryotic cells, have the greatest metabolic diversity of all organisms, classified into two domains that differ in structure, physiology, and biochemistry, bacteria. Many important for food production (cheese, yogurt) Not well known only discovered ~40 years ago. Share some cellular features with bacteria, some with eukaryotes, and some unique. Many live in very extreme conditions that no other organisms can survice: morphology, are unicellular but can combine into multicellular, three common cell shapes. Some can be square-shaped: are very small. Diameters in the range of 1 to 10 m: cell structure, external: Sticky capsule: layer that lies outside of cell wall, consists of polysaccharides, protects bacteria from external environment, desiccation, extreme temperatures, antibiotics. Invading viruses: considered a virulence factor, helps to evade detection by immune cells. Pili and fimbriae: pilius (singular) - a hairlike appendage found on the surface of many bacteria (from the.

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