BIO 1130 Study Guide - Amoeboid Movement, Proterozoic, Cytoplasmic Streaming

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

9+2 organization refers to the structure / configuration of the flagellar set up involved in protist locomotion. Flagellum in protists differ from that of bacterium. Flagella are set up with microtubules (where tubulin is the major protein) and these microtubules are polymerized into a 9+2 structure. In this configuration, there are 9 paired clusters around a central core pair with dyenin arms connecting the pairs. The dyenin motor / arm acts like a myosin motor, where it crawls around the microtubule tract (the central core of the structure) for movement. The dyenin motors are located in the flagella. Alternations of generations deals with the life cycle of organisms such as brown algae and other plant-like protists. In an alternation of generations life cycle, both the haplontic and diplontic cycles have equal contribution. The first stage involves a sporophyte (2n) which creates spores (n) by meiosis.