Presentation on theme: "Cell Structure and Function"— Presentation transcript:
1Cell 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)
2Objectives 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.
4Nucleus 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.
5Mitochondria & chloroplasts Inner membrane & outer membraneFunction in cellular respirationEspecially abundant in muscle cellsChloroplastsFunction in photosynthesisEspecially abundant in leaf cells
6Endoplasmic reticulum One membrane surrounding lumenLipid bilayer synthesis, transport to membranesRough endoplasmic reticulum (with ribosomes)Proteins imported into ER as they are madeSmooth endoplasmic reticulum
7Ribosomes No membranes 2 subunits composed of protein & RNA Protein synthesis from info in messenger RNAEspecially abundant in cells that secrete proteins
8Lysosomes & peroxisomes One membraneIntracellular digestionPeroxisomesOxidation of toxins by peroxideEspecially abundant in protective tissues
9Golgi apparatus Stack of membrane-bound “pancakes” Staging area for ER products