BIOL 112 Lecture Notes - Lecture 9: Cell Adhesion, Myosin, Bacteria

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Lucy- Ann Joseph

Document Summary

Biol 112-lecture 9-cell organelles, cytoskeleton and cell adhesion. Mitochondrion: two layers of membrane, matrix between inner and outer membrane, most chemical reactions take place here, where citric acid cycle happens, generates atp, contains some dna, rna, and ribosomes. Many proteins that regulate polymerization and depolymerisation non covalent protein-protein interaction (through h bonds and etc. ) has polarity (- end and + end) actin in gut cells: epithelium cells connected to each other by actin (cortical). Actin also makes the extension of the cell to increase the surface area for digestion. Actin and myosin interact to cause movement (muscle contraction) How it works: 2 or more myosin come together, coiled-coil tail domain of myosin can interact to form antiparallel bipolar complexes between actin filaments. Myosin heads can move along actin filaments in only one direction. Actin-myosin interaction: e. g. cytokinesis in animals (cell division, pinch membrane into 2) & cytoplasmic streaming in plants (move cytoplasm around cell: microtubules.