MIMM 211 Lecture Notes - Lecture 5: Diplococcus, Spirillum, Bacilli
13 Dec 2018
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Shape and arrangement of cells: spherical or ellipsoidal cells, cocci (singular, coccus, cylindrical or rodlike, bacilli (singular, bacillus, helical or spiral cells, spirilla (singular, spirillum, others irregular: square, star etc. The organization of these cells is directly related to how they divide (we will see this more later) There aren"t many bacteria that have the vibrio shape (comma shape) but they are very important human pathogens: the shape plays a key role in the way the bacteria swim in their environment. What is missing from the previous slide is the sarcinae structure which is the association of two tetrads. The bacteria will always divide in a lengthwise plane (so that they become long chains) rather than stacking because it takes a lot less energy to do so. When cells are ellipsoidal shape coccobacillus: not quite a circle but not long enough to be a rod either.
