Homeostasis and transport (part 1)

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  • 1. Biology I: Homeostasis and Transport (Part 1) Mr. Nettles
  • 2. 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)
  • 3. 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
  • 4. 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
  • 5. Today’s Objectives
    • I will define: homeostasis, semi-permeable, concentration, and equilibrium .
    • I will describe three types of passive transport .
  • 6. 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
  • 7. Think!!
    • What does the cell membrane do?
  • 8. 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
  • 9. What’s happening in this picture? semipermeable
  • 10. Equilibrium
    • Equilibrium:
    Both sides are equal Nature wants equilibrium!
  • 11. 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
  • 12. Diffusion
    • Molecules move from areas of high concentration to areas of low concentration.
    • Molecules move to areas that are less crowded.
  • 13. Think!!
    • When is equilibrium reached?
  • 14. Facilitated Diffusion
    • Diffusion that involves a protein channel or carrier
      • Does NOT use energy
  • 15. 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.
  • 16. 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