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Homeostasis and transport (part 1)
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Homeostasis and transport (part 1)

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    Homeostasis and transport (part 1) Homeostasis and transport (part 1) Presentation Transcript

    • Biology I: Homeostasis and Transport (Part 1) Mr. Nettles
    • Agenda – Tuesday, Sept. 13, 2011
      • Warm-Up (7 min)
      • Today’s Agenda (3 min)
      • Lesson (25 min)
      • Wrap-Up (5 min)
      • Review- Biomolecules (15 min)
    • Warm-Up (Bonus!!)
      • Which molecules store and transmit genetic information?
      • a) lipids, b) proteins, c) nucleic acids, d) carbohydrates
      • Antibodies are composed primarily of amino acids. In which class of biomolecules would antibodies belong?
      • a) lipids, b) proteins, c) nucleic acids, d) carbohydrates
      • Which cell structures cause the outer surface of the endoplasmic reticulum to appear rough?
      • a) ribosomes, b) proteins, c) the mitochondria, d) the Golgi
    • Warm-Up (Bonus!!)
      • Which molecules store and transmit genetic information?
      • a) lipids, b) proteins, c) nucleic acids , d) carbohydrates
      • Antibodies are composed primarily of amino acids. In which class of biomolecules would antibodies belong?
      • a) lipids, b) proteins , c) nucleic acids, d) carbohydrates
      • Which cell structures cause the outer surface of the endoplasmic reticulum to appear rough?
      • a) ribosomes , b) proteins, c) the mitochondria, d) the Golgi
    • Today’s Objectives
      • I will define: homeostasis, semi-permeable, concentration, and equilibrium .
      • I will describe three types of passive transport .
    • Homeostasis
      • Cells must maintain a stable internal environment .
            • having the right amount of water and nutrients
            • getting rid of wastes
            • staying at the right temperature
      • Homeostasis = the ability to maintain a stable internal (inside) environment
    • Think!!
      • What does the cell membrane do?
    • Moving Across the Cell Membrane
      • The cell membrane is semi-permeable meaning some things can go across and others can’t.
      • Concentration = how crowded a certain location is with molecules
    • What’s happening in this picture? semipermeable
    • Equilibrium
      • Equilibrium:
      Both sides are equal Nature wants equilibrium!
    • Passive Transport
      • The movement of materials in and out of the cell without using energy is called passive transport .
      • There are 3 types of passive transport:
        • Diffusion
        • Facilitated diffusion
        • Osmosis
    • Diffusion
      • Molecules move from areas of high concentration to areas of low concentration.
      • Molecules move to areas that are less crowded.
    • Think!!
      • When is equilibrium reached?
    • Facilitated Diffusion
      • Diffusion that involves a protein channel or carrier
        • Does NOT use energy
    • Wrap-Up
      • What is homeostasis?
      • True or False?
      • Passive transport is the moves materials in and out of the cell using energy.
      • List the three types of passive transport.
    • Review: Biomolecule Bingo
      • This is a chance to earn 5% points of Friday’s Quiz!!
      • Listen carefully to the “bingo clues” and write down the name of the biomolecule related to the clue.
      • Carbohydrates, Lipids, Proteins, Nucleic Acids