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Transcript
Cells! Who wants some?! Not that type, but this kind… A cell is the basic unit of life Animal Cell Nucleus • Control Center • Contains nearly all DNA – instructions for making proteins and other important molecules • Surrounded by nuclear envelope/membrane – Dotted with nuclear pores = stuff in and out • Key processes: Controls metabolism of cell, control Cell division, proteinsynthesis Chromosome • (The Data) … all the directions • (DNA) Nucleolus • Nucleolus – small dense region inside nucleus. Ribosomes are made here. Endoplasmic Reticulum • Transportation • Rough Endoplasmic Reticulum (RER) – Covered in ribosomes (rough) – Makes and transports proteins, especially membrane proteins • Smooth Endoplasmic Reticulum (SER) – Synthesis (make) of membrane lipids – Contain enzymes that can detoxification of drugs – Liver has lots of SER’s Notice how the E.R. is attached to the nucleus …. Like the ‘hallways’ Smooth and Rough ER Key process: Transportation of molecules Ribosomes! • Protein Factory • Proteins are assembled on these organelles by following coded instructions from the nucleus Key process: Proteinsynthesis Nuclear Pores review! Nuclear Envelope ER Nucleus Ribosomes Golgi Apparatus • Packaging Center • Modify, sort, and package proteins and other materials from the endoplasmic reticulum for storage or secretion. Key processes: Packaging and sorting of proteins http://www.sumanasinc.com/webcontent/animations/content/ve siclebudding.html http://bcs.whfreeman.com/thelifewire/content/chp04/0402002.ht ml Mitochondria • Power House • Convert chemical energy stored in food to a form a cell can use (ATP) during the process of cellular respiration. • Contain own ‘Mitochondrial DNA’ • Has double membrane Key process: Cellular respiration C6H12O6 + O2 H2O +CO2 + ATP Mitochondria/Chloroplasts (only in plant cells) • These two utilize energy from food and the sun respectively and convert it into energy the cell can use. Process = support Cytoskeleton • Cell Framework • A network of protein filaments that helps the cell to maintain its shape • Storage Facility Vacuoles • Plants have big vacuoles, animal cells many small vacuoles. • Store materials like water, salts, proteins, and carbohydrates • In plants, there is a large vacuole which helps with maintaining pressure (turgor pressure) – Allows plant to support heavy loads like leaves and branches Lysosome • Waste Management • In animal cells ONLY • Have enzymes used to break down lipids, carbohydrates, and proteins • breaking down old organelles – even old cells can be broken down in a process called autolysis. • Sometimes called suicide sacs. Process - Digestion Cell boundaries aka cell membrane • Cell membrane regulates what enters/leaves the cell. Process - Osmosis 2 Layers of phosholipids studded with proteins = “fluid mosaic model” http://www.susanahalpine.com/anim/Life/memb.htm Centrioles Only in animal cells. Plays a role during cell division. Assist in the making of cilia and flagella. Process – Cell division Come on baby let’s do the locomotion…… • Cilia • Flagella