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Cell Structure

Cell Structure. What is the role of the cell nucleus? What are the functions of vacuoles, lysosomes, and the cytoskeleton? What organelles help make and transport proteins? What are the functions of chloroplasts and mitochondria? What is the function of the cell membrane?.

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Cell Structure

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  1. Cell Structure What is the role of the cell nucleus? What are the functions of vacuoles, lysosomes, and the cytoskeleton? What organelles help make and transport proteins? What are the functions of chloroplasts and mitochondria? What is the function of the cell membrane?

  2. Cell Organization-Eukaryotes • Complex busy place, divide it into two parts. The Nucleus and the Cytoplasm • Cytoplasm is the part of the cell outside the Nucleus • Organelles are specialized parts of the cell, “little organs” • The cell is kind of like a factory or a city, everything has a job that is important to the cell

  3. Nucleus • Contains the DNA, with instructions for making proteins and other important molecules (prokaryotes have DNA which does the same but without the nucleus) • Nucleus is surrounded by the nuclear envelope • Nuclear envelope contains nuclear pores that allow material to move in and out of the nucleus • Chromosomes are found in the nucleus as well this is the genetic info

  4. Organelles that store, clean up and support Vacuoles/Vesicles “Storage” Lysosomes “Clean-up Crew” Cytoskeleton “Support System”

  5. Vacuoles • A sac-like membrane enclosed structure • Store material (water, salt, protein, carbs) • Plant cells have large ‘central vacuole’ • Helps to increase rigidity • Helps to hold leaves and flowers • What happens to a vacuole that may cause a plant to wilt?

  6. Vacuoles… • Unicellular organisms and animals may have cells with vacuoles too. • Paramecium has a “contractile vacuole”, which pumps out water from the cell • They help move materials between surfaces, and to and from the cells surface

  7. Lysosomes • Found in both plant and animal cells • Removes ‘Junk’ from the cell • Some diseases can be attributed to Lysosomes failure • Break down lipids, carbohydrates, and proteins into smaller molecules. • Remember what these molecules were called? • Break down organelles that have outlived usefulness

  8. Cytoskeleton • Network of protein filaments • Helps transport materials between different part of the cell • Also involved in movement, cilia and flagella are parts of the cytoskeleton

  9. Cytoskeleton…Two Types Microfilaments Microtubules Hollow structures Protein called tubulins Important to cell division, organization Not found in plant cells Help build cilia and flagella, which helps cells “swim” through liquid • Thread-like • Protein called actin • Form flexible framework for cell • Helps cell move • Assembly and disassembly responsible for movement of amoebas or other cells that ‘crawl’

  10. Organelles that build proteins Ribosomes “Machine” Endoplasmic Reticulum “Assembly of Lipid” Golgi Apparatus “Shipping”

  11. Ribosomes • Makes/assembles proteins • Small particles of RNA and protein found in cytoplasm • Follows instructions from its’ “Boss” DNA to make proteins • If a cell is an especially active protein maker it will contain more ribosomes

  12. Endoplasmic Reticulum Rough ER Smooth ER No ribosomes on surface Contains enzymesthat perform specialized tasks Like synthesis of membrane Detoxification (Liver Cells) • Ribosomes on surface • May modify proteins made by the Ribosomes • Proteins made will be released, secreted, and destined for lysosomes • Abundant in cells that make a lot of protein for export

  13. Golgi Apparatus • Modifies, sorts, and packages proteins and other material for either storage in the cell, or transportation out of it • Finishing touches are put on the proteins before “shipment” from the cell

  14. Organelles that capture and release energy Chloroplasts “Solar Power Plant” Mitochondria “Power Plant”

  15. Chloroplasts • Capture energy from the sun and convert it into energy for the cell • There are two membranes around a chloroplast, as well as other membranes within the organelle, which contain the green colored chlorophyll • Contain it’s own DNA, theory is it may have descended from an independent microorganism

  16. Mitochondria • Found in nearly all eukaryotic cells, and plants • Convert the energy stored in food to compounds which can be more easily used by the cell • Has outer and inner membrane like the chloroplasts • Inner membrane is folded up inside • Like the Chloroplasts it also contains its’ own DNA “endosymbiotic theory” we’ll talk about this later in the year

  17. Cellular Boundaries Cell Walls “Roof” Cell Membranes

  18. Cell Wall • Some organisms may have cell wall and membrane • Most prokaryotes and eukaryotes have it for protection • Animal cells DO NOT have cell walls • Porous, allows some materials to pass through easily • Provide strength for plants

  19. Cell Membrane • Flexible structure from a lipid bilayer • Regulates what enters and leaves the cell • Protects and supports • Some made from lipid bilayer • Hydrophilic and Hydrophobic parts to keep water out • Proteins found within it • Most are selectively permeable or semi permeable

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