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Transcript
CELLS Prokaryotic Cells • Less advanced and less complex (more primitive) • No nucleus: DNA is free floating • Still carry out all characteristics of life • a.k.a: bacteria! Eukaryotic Cells • Cell of organisms more advanced than bacteria (animals, plants, fungus, and some single celled protists). • More complex • DNA contained inside the nucleus PLANT CELL (eukaryotic) ANIMAL CELL (eukaryotic) NUCLEUS NUCLEUS • FUNCTION: Control center of the cell: “brain of cell” – CONTAINS GENETIC MATERIAL (DNA) – CONTROLS ALL CELL ACTIVITIES – FOUND IN ALL CELLS EXCEPT BACTERIA (EXCEPT PROKARYOTES) • In both PLANT and ANIMAL cells Factory analogy: The ‘BOSS’ --management/ CEO CELL MEMBRANE • ALL CELLS HAVE CELL MEMBRANE – PROTECTS CELL – CONTROLS WHAT ENTERS AND EXITS CELL – CONSISTS OF 2LAYERS OF LIPIDS AND PROTEIN CHANNELS • In both PLANT and ANIMAL cells FACTORY ANALOGY: Security or doors CELL WALL • PROTECTS the cell and provides SUPPORT structure (at cellular level) for plant cells • In PLANT cells and some bacterial cells FACTORY ANALOGY outside walls or structure of the building CYTOPLASM • Cytoplasm is the contents of the cell that is inside the membrane but outside the nucleus. • Suspends the other cell parts such as ribosomes, mitochondria, nucleus, etc. • Essentially water with dissolved substances. • In both PLANT and ANIMAL cells FACTORY ANALOGY Internal walls and ceilings CYTOSKELETON • Network of protein filaments that helps a cell to maintain its shape • Also involved in transport around cell • In both PLANT and ANIMAL cells FACTORY ANALOGY: Beams that support the walls & ceilings or Transportation system MITOCHONDRIA • FUNCTIONS: ‘POWER HOUSE’ OF CELL (‘mighty mitochondria”) – CONVERTS ENERGY (GLUCOSE) INTO USABLE FORM (ATP) FOR CELL • In both PLANT and ANIMAL cells • Note: 1 mitochondrion, multiple mitochondria FACTORY ANALOGY: power supply/ generators CHLOROPLASTS FUNCTION: CONVERT SUNLIGHT ENERGY INTO SUGAR (GLUCOSE) via photosynthesis – GREEN because of PIGMENT CHLOROPHYLL FACTORY ANALOGY solar panels RIBOSOMES • FUNCTION: PROTIENS MANUFACTURING • SOME ARE ‘FREE’ AND SOME ARE ATTACHED TO ENDOPLASMIC RETICULUM (ER) • IN BOTH PLANT AND ANIMAL CELLS FACTORY ANALOGY WORKERS ENDOPLASMIC RETICULUM (ER) ENDOPLASMIC RETICULUM (ER) • There are two types of endoplasmic reticulum (rough and smooth) • FUNCTION: assembles lipids, proteins, and other molecules for transport to other parts of cell or for export from the cell • In both PLANT and ANIMAL cells • FACTORY ANALOGY: assembly line GOLGI APPARATUS also known as ‘golgi bodies’ • FUNCTION: modifies, sorts, packages and labels materials • In both PLANT and ANIMAL cells FACTORY ANALOGY: Mailroom/ shipping or warehouse LYSOSOMES • FUNCTION: CLEANUP CREW OF CELL – Breaks down waste and other molecules for disposal/ recycling – Contain digestive enzymes that break down waste • In both PLANT & ANIMAL cells • FACTORY ANALOGY: custodians/ recycling VACUOLES FUNCTION: PROVIDES A PLACE FOR STORAGE – CONTAINS MAINLY WATER, SALT, NUTRIENTS AND WASTE PRODUCTS – THE ‘CENTRAL VACUOLE’ IN PLANT CELLS’ OCCUPIES ¾ OF CELL VOLUME • Primarily in plant cells, but also some animal cells • FACTORY ANALOGY: Storage rooms for extra supplies, overstock