BIOL 112 Lecture 9: Cells 2

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Frieder Schoeck

Document Summary

Citric acid cycle, dna and rna synthesis, ribosomes. Carbon fixation yielding sugars, amino acids, fatty acids, dna, rna, ribosomes, thylakoids for photosynthesis. Own genome, double membrane, own ribosomes, similar genes to bacteria. Actin exists as monomers and filaments, many proteins that regulate polymerization and depolymerization. Myosin can only move along actin in one direction. Attached to transport vesicle, every step requires atp. Form ropelike structures in cells to provide mechanical strength to cells (coiled keratin) or nucleus (lamins) Coiled coils only arise when two alpha helices have hydrophobic amino acids every 4th time. Actin filament, plasma membrane, ecm with collagen, fibronectin, integrin. Fibrous structural proteins consist of mostly coiled coils. Collagen proteins consist of three polypeptide chains, wound around each other. Cell recognition: one cell specifically binds to a certain type of other, leading to phagocytosis, dna exchange, sperm-egg fusion. Tight junction, adherens junction, desmosome, gap junction, focal adhesion. Tight junction: watertight seal between epithelial cells membrane proteins bind.