BIOL 115 Chapter Notes - Chapter 1: Intermediate Filament, Cytoplasmic Streaming, Microfilament
Document Summary
Reinforces plasma membrane and helps with movement for organelles or the whole cell. Cytoskeleton has three parts: microtubules, intermediate filaments, and microfilaments. Intermediate filaments are fibers that occur singly in parallel bundles and in interlinked tubes. Microfilaments are thin fibers that cohost of protein fibers wound around each other in a spiral. The cell movements are created by motor proteins that attach one end to the vesicle, microtubule, or microfilament and the other end has reactive group that walk along another microtubule or microfilament by forcefully swiveling a short distance. Microtubules are responsible for movements including amoeboid motion, cytoplasmic streaming (flowing motion of cytoplasm) and contraction of muscles. When animal cells separate microtubules pull apart the chromosome while microfilament pulls apart the cytoplasm. The flagella of eukaryotes and prokaryotes are not evolutionary related: Even though the flagellum of both eukaryotes and prokaryotes look and serve the same function they are structurally different.
