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Unformatted text preview: 1 02/06/07 BILD1 - Lecture 8 1 BILD1 The Cell Prof. Lisa M. Boulanger 02/06/07 BILD1 - Lecture 8 2 Feedback! 02/06/07 BILD1 - Lecture 8 3 Problem Set 3 posted, discussed this week Midterm 1 KEY posted today Regrades on exams in non-erasable pen only Regrade requests must be submitted in writing, on paper by Feb. 15 th Whole exam will be regraded! 02/06/07 BILD1 - Lecture 8 4 All cells have plasma membrane, cytosol, chromosomes, ribosomes prokaryotes ( no nucleus, few / no organelles, smaller) eukaryotes (nucleus, mitochondria and/or chloroplasts, cytoskeleton, endomembrane system, larger) Nucleus: DNA, nuclear envelope (double phospholipid bilayer) Ribosomes: make proteins--free, bound Mitochondria, chloroplasts: have DNA, produce energy, double phospholipid bilayer Peroxisomes: add hydroxyl to toxins, make peroxide, convert to water Highlights from previous lecture: 02/06/07 BILD1 - Lecture 8 5 The endomembrane system includes : nuclear envelope endoplasmic reticulum (smooth vs rough) Golgi apparatus (protein sorting, shipping) plasma membrane Lysosome (phagocytosis, autophagy) vacuoles (food, contractile, central) The cytoskeleton affects support, motility, function Microtubules (tubulin): cilia and flagella Microfilaments (actin): microvilli, amoeboid movement, cytoplasmic streaming Intermediate filaments (keratin) 02/06/07 BILD1 - Lecture 8 6 THIS LECTURE: The plasma membrane: Whats in it, What can cross it, and How! 2 02/06/07 BILD1 - Lecture 8 7 Cell Walls of Plants Extracellular components and connections between cells help coordinate cellular activities The cell wall Is an extracellular structure of plant cells that distinguishes them from animal cells 02/06/07 BILD1 - Lecture 8 8 Plant cell walls Are made of cellulose fibers embedded in other polysaccharides and protein May have multiple layers Central vacuole of cel Plasma membrane Secondary cel wal Primary cel wal Middle lamel a 1 m Central vacuole of cel Central vacuole Cytosol Plasma membrane Plant cell walls Plasmodesmata 02/06/07 BILD1 - Lecture 8 9 The Extracellular Matrix (ECM) of Animal Cells Animal cells Lack cell walls Are covered by an elaborate matrix, the ECM Functions of the ECM include Support Adhesion Movement Regulation 02/06/07 BILD1 - Lecture 8 10 The ECM Is made up of glycoproteins and other macromolecules Col agen Fibronectin Plasma membrane EXTRACELLULAR FLUID Micro- filaments CYTOPLASM Integrins Polysaccharide molecule Carbo- hydrates Proteoglycan molecule Core protein Integrin A proteoglycan complex 02/06/07 BILD1 - Lecture 8 11 Plants: Plasmodesmata Plasmodesmata Are channels that perforate plant cell walls Interior of cell Interior of cell 0.5 m Plasmodesmata Plasma membranes Cell walls Intercellular Junctions 02/06/07 BILD1 - Lecture 8 12 Tight junctions prevent fluid from moving across a layer of cel s...
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This note was uploaded on 03/26/2010 for the course BENG 110 taught by Professor Schmid-schoenbein during the Spring '08 term at UCSD.
- Spring '08