Presentation on theme: "Cell Structure and Function"— Presentation transcript:
1 Cell Structure and Function Donald Winslow, St. Gregory’s University25 January 2011Readings:Mader, Sylvia 2011Inquiry into Life, 13th ed.McGraw-Hill, NYCh. 3; pp 47-52, 54-61, 63Ch. 4; pp 68-69, (on membranes)
2 Objectives List organelles found in most cells. Describe structure & function of these organelles.Give examples of cells where particular types of organelles are abundant.Describe structure & function of cell membranes.Contrast cell membranes & cell walls.Explain membrane transport processes.
4 Nucleus Envelope (2 membranes) Functions in DNA replication & RNA synthesisMost eukaryotic cells have one nucleus.Syncytial eukaryotic cells have multiple nuclei.Prokaryotic cells do not have nuclei.
5 Mitochondria & chloroplasts Inner membrane & outer membraneFunction in cellular respirationEspecially abundant in muscle cellsChloroplastsFunction in photosynthesisEspecially abundant in leaf cells
6 Endoplasmic reticulum One membrane surrounding lumenLipid bilayer synthesis, transport to membranesRough endoplasmic reticulum (with ribosomes)Proteins imported into ER as they are madeSmooth endoplasmic reticulum
7 Ribosomes No membranes 2 subunits composed of protein & RNA Protein synthesis from info in messenger RNAEspecially abundant in cells that secrete proteins
8 Lysosomes & peroxisomes One membraneIntracellular digestionPeroxisomesOxidation of toxins by peroxideEspecially abundant in protective tissues
9 Golgi apparatus Stack of membrane-bound “pancakes” Staging area for ER products