MICRB 201 Lecture Notes - Lecture 4: Cross-Link, Extrachromosomal Dna, Glycan
13 Sep 2017
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Cellular forms of life can be placed in one of the three domains of life (slide: eubacteria (true bacteria, archaebacteria (ancient bacteria, eukarya (eukaryotes) Eubbacteria and archaebacteria are prokaryotes lack a nuclear membrane: eurkaryotes (e. g. algae/plants, fungi/animals, protozoa) possess a nuclear membrane (fig 3. 25) (slide 2) Microbes, depending on the species, can be either prokaryotes or eukaryotes: eukaryotes ex. Generally, very small: however, very large size range, e. g. mycoplasmas ~ 0. 2 diameter. 2 major shapes: spghers or cocci (sing. Staphylococci (e. g. staph aureus) occur in graph like clusters (fig 18. 16a) (slide 4) Diplococcu (e. g. neisseria gonorrhoeae; n. meningitidis; fig. Pyogenes) chains (fig 18. 16 b) (slide 4: rods or bacilli (sing. Bacilli true rods (e. g. salmonella typhi, fig 2. 6b) (slide 6) Vibrio"s comma-shaped (fig 25. 18a) (slide 7) Note: the term bacillus describes both a shape and genus of bacteria: spirochaetes flexible, helical rods (fig 18. 46) (slide 8) Most cocci are gram positive (notable exception: neisseria species)
