Selectively Permeable Membranes

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Selectively Permeable Membranes Lab

• Honors Biology

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Pre-lab

• Before you begin the lab, it is important that
  you answer the 5 pre-lab questions.
• Use the next few slides (or your notes or the
  book) if you do not already know the answers to
  these questions!

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Did you know?

• Isotonic solutions have the same amount of solute
  as a cell

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Did you know?

• Hypertonic Solutions have more solute than a cell

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Did you know?

• Hypotonic solutions have less solute than a cell

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Still confused?

• Here is a great animation of hypertonic/hypertonic
  cellshttp//www.zerobio.com/flashmx/tonicity.sw
  f
• Here are pictures of actual cells in all 3
  solutions
• http//highered.mcgraw-hill.com/sites/0072495855/s
  tudent_view0/chapter21/animation__hemolysis_and_cr
  enation.html

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Part I

• Plant Root Tissues in Solution

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Plant Tissue in Solution
Distilled Water
15 Salt Solution
5 Salt Solution
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Part II

• Plant Leaf Cells in Solution

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Plant Leaf Cells in Solution
Initial Image
Salt Water Solution
Distilled Water
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Want to see another image for Part II?

• Here is a link to a YouTube video that will help
  you see what happens to a cell placed in a salt
  water solution http//www.youtube.com/watch?vlzD
  lGl3b4isfeaturerelated
• This is an onion cell, so you will not see
  chloroplasts, but it will really help you see the
  change in size of the cell! Remember that the
  cell wall will not change size, just the cell
  membrane.

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Part III

• Simulated Animal Cells in Solution

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Simulated Animal Cells in Solution
Benedicts Test After 24 Hours
Initial Set-Up




Iodine Test After 24 Hours
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Post-Lab

• Now answer the 5 post-lab questions.
• If you have any questions please see your
  teacher! You will be designing your own lab
  investigations in the coming week and all of the
  information from this lab will be important to
  understand!