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Unformatted text preview: BME 418, Quantitative Cell Biology Alan J. Hunt Lecture #25: Flagella and Cilia Previously we discussed bacterial flagella. Bacteria are propelled by a small rotating motor embedded in the bacterial membrane, which turns a long helical flagella. Although the mechanism underlying rotation of the flagellar motor are not worked out, on the surface this seems a very simple solution to motility; a minimalist solution by a minimalist organism. This constrasts with the much larger and more complex eukaryotic flagella, seen here on Chlamydomonas :- Larger than bacterial flagella: d= 0.25 um vs. 10-20 nm, l=10-200 um vs. a few um.- Many components in stead of one (just flagellin in bacteria)- Planar waves instead of helical.- Exhibit more than one kind of motion (Chlamy. swimming for example)- Basal bodies at attachment site, similar to centrioles, serve dual role in Chlamy. BME 418, Quantitative Cell Biology Alan J. Hunt Paramecium:- Cilia and gullet....
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This note was uploaded on 09/06/2008 for the course BIOMEDE 418 taught by Professor Hunt during the Winter '08 term at University of Michigan.
- Winter '08