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Class Topics

To complete the Eggsperiment and understand passive and active transport. Schedule availability, notes, and future assignments included.

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Class Topics

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  1. Hand in W.S. “Homeostasis and transport” before the bell rings Please do not hand in the lab “Eggsperiment” Chapter 4 Quiz 1 Notes – Chapter 4 Active Transport “Man’s mind stretched to a new idea never goes back to its original dimensions.” Oliver Wendell Holmes To complete the eggsperiment, assess knowledge gained about passive transport and learn about active transport. Title: Biology 11/10/06 Class Topics Objectives: Monday, January 6, 20208:50 AM

  2. Miscellaneous • Do not assume I will be available for help after school • Before school I will still be available • If I’m not in my room, check other places! • I will be available during homeroom • Check with me about after school time • Review times can be arranged ahead of time

  3. Eggsperiment • Determine a range for the percentage of water and the percentage of solute in your egg. • Explain how you determined this • Write a description of how you could find the exact percentage of water and solute in your egg. Hand in the ‘Eggsperiment’

  4. Class Assignments What By When • Eggsperiment 11/10/06 • W.S. “Homeostasis and transport” 11/10/06 • Chapter 4 Quiz 1 11/10/06 • W.S. 4.2 (DR/Quiz) 11/14/06 • Due this class period • Due next class period • Due in the future

  5. Grade Sheet 1A – SR p. 61 - 5 pts Measurement W.S. – 10 pts 3A SR p. 42 – 6 pts 4A – SR p. 47 – 5 pts 2A – Measurement W.S. – 10 pts

  6. Postquiz Activities • Hand in quiz • Pick up “Active Transport” handout • Read 81-86

  7. Ion Channels(a type of facilitated diffusion) • Transport proteins have polar channels for the important ions to pass • Na+, K+, Ca2+, and Cl- • Fig 3 • Used in maintaining electrical charge or nerve cells

  8. Active Transport • Using energy to move particles across the cell membrane - through an transport protein (pump) • Usually against the concentration gradient - like going up a hill • Ex. glucose into liver and muscle cells for storage • from a low concentration in the bloodstream to a high concentration in the cells

  9. Sodium-Potassium Pumpfigure 5 • Found in nerve cells • Pumps 3 Na+ out of the cell and 2 K+ into the cell • Both against their concentration gradient

  10. From: http://www.accessexcellence.org/RC/VL/GG/passActiveTrans.html

  11. Bulk Transport • Also known as cytosis • Uses cell energy (active transport) • Moving large particles - larger than integral proteins - into or out of the cell • Endocytosis – into the cell • Exocytosis- out of the cell

  12. From: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBooktransp.html

  13. Exocytosis • Excretion • release waste • Secretion • release products • enzymes, carbohydrates, or hormones made by the cell

  14. Membrane Receptor Proteins • Signal molecules bind to receptor proteins and causes a change in the cell • Changes in permeability • Open ion channel • Second messengers • Activates another protein inside the cell • Enzyme action • Speeds up a reaction (heroin)

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