By Nader Hassanzadeh
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Extra resources for Bacterial cell structure
Paustain,2001 34 Flagella Prokaryotes vs. eukaryotes Possess simple flagella. Composed of single flagellin fiber. Lack 9+2 structure of eukaryotic flagella and cilia. Flagellar motion resembles spinning propeller. Flagella, usually at the poles of the cells (for movement) and fimbriae or pili, smaller thread-like appendages, usually at multiple locations (function in attachment or conjugation). There is some evidence that flagellated cells produce larger lesions than non-flagellated mutants.
Chemotaxis can be demonstrated on an agar plate that contains various nutrients. Positive chemotaxis by E. coli on the left. The outer ring is composed of bacteria consuming serine. The second ring was formed by E. coli consuming aspartate, a less powerful attractant. The upper right colony is composed of motile, but nonchemotactic mutants. The bottom right colony is formed by nonmotile bacteria. Prescott,2006 44 Directed movement in bacteria a) b) Random movement of a bacterium in the absence of a concentration gradient.
A. B. These proteins have important roles in: Cell growth-cell shape Chromosome segregation. FtsZ forms a ring-shaped structure(blue) during cell division that is required for the division process (a). When actin-like MreB homologues are present, cells can take on a rod shaped morphology like that seen in Escherichia coli (b). Caulobacter crescentus cells contain crescentin (yellow) in addition to FtsZ and MreB, and show a crescent-shaped cell morphology(c). e. g. in Spiroplasma cells). Membrane-bound ribbon following the shortest helical line on the cellular coil, and composed of several well-ordered fibrils.
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