Transcript Chapter 5 Demos!

Selectively Permeable
Membranes “Lab”
Honors Biology
Pre-lab
• Before you begin the lab, it is
important that you answer the 5 prelab questions.
• Use the next few slides (or your notes
or the book) if you do not already
know the answers to these questions!
Did you know?
• Isotonic solutions have the same
amount of solute as a cell
Did you know?
• Hypertonic Solutions have more
solute than a cell
Did you know?
• Hypotonic solutions have less solute
than a cell
Still confused?
Here is a great animation of hypertonic/hypertonic cells:
http://www.zerobio.com/flashmx/tonicity.swf
Here are pictures of actual cells in all 3 solutions:
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter21/
animation__hemolysis_and_crenation.html
Part I
Plant Root Tissues in Solution
Plant Tissue in Solution
Distilled
Water
5% Salt
Solution
15% Salt
Solution
Part II
Plant Leaf Cells in Solution
Plant Leaf Cells in
Solution
Initial Image
Salt Water Solution
Distilled Water
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?v=lzDlGl3b4is&fe
ature=related
• 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.
Part III
Simulated Animal Cells in Solution
Simulated Animal Cells in
Solution
Initial Set-Up
Benedict’s Test
After 24 Hours
Iodine Test
After 24 Hours
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!