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Chapter 5:1-9 The Working Cell - Transport across Membranes

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Biology Homework Chapter 5: Membrane Transport Mechanisms


Reading Preparation

Textbook assignment: Chapter 5:1-9 The Working Cell, sections 1-9.

Study Notes

Web Lecture

Read the following weblecture before chat: Transport across Membranes

Take notes on any questions you have, and be prepared to discuss the lecture in chat.

Study Activity

Perform the study activity below:

  • Use the Membrane Transport Simulation to see the effects of concentrations and permeability on diffusion.
    1. Accept the challenge to create a blue hypertonic extracellular solution, one whose concentration on the outside (upper portion) of the membrane will have more blue cells than the cellular (lower) volume.
    2. Reduce permeability, the ability to pass directly through the membrane, by increasing the blue molecule size.
    3. Increase active transport from inside to outside the cell by increasing the active transport "Uniporters" for blue moleules that kick molecules "up".
    4. Increase temperature to speed up transport. After enough molecules collect om the extracellular area, the solution should turn hypertonic.
    5. Now that you know how this works, accept the next challenge and see if if you can adjust temperature, molecule size, and active transport proteins to achieve the target solutions.

Chat Preparation Activities

Chapter Quiz

Lab Work

Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.