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Colchicine- prevents microtubules from forming; bad because we need them to be actively growing. Affects transport F-actin - Microfilament - Part of cell that’s moving: lamellipodium - Actin br... anches and bundles - Bundles are essential for strength - Dynamic because it branches a lot - Arp2/3 complex- starts polymerization at branch points; allows actin to build new branches - G actin+ F actin takes? Makes? ATP - Why do we need branches?- forms meshwork, controls microfilament formation in lamellipodium to permit directive movement - Actin grows against the membrane of a cell moving in that direction; pushing movement creates force - Myosin: motor protein used with actin (do not need to know different types of myosin) - Conventional myosin – muscle contraction (actin sliding past each other) - Unconventional myosin – cell motilit, contributes to non muscle cells, pulls trailing edge of cell forward In animals - Motor proteins and components of cytoskeleton collaborate to carry pigments NUCLEUS Function - Storage- genetic information - Replication - Repair of genetic material - Site of transcription (different types of proteins) - Splicing - Ribosome biosynthesis Structure Nuclear envelope - Nuclear membrane - Nuclear pores [Show More]

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