Yeast Lab

Today you will (finally) complete the yeast lab.  

Remember the question is:
What effects the rate of respiration in baking yeast?

More about selective permeability, another run at cellular respiration

Cellular Respiration

Collect data again on your seeds.  Is there a change in the Carbon dioxide concentration in the chamber?


Selective Permeability

There is a great Phet simulation for membrane channels.  Click here to view and go through the simulation.  Take screen shots and explain what is happening in terms of selective permeability.  Does it matter how many channels are in the membrane?  Does the severity of the concentration gradient effect the rate of diffusion?  Use your data from this simulation in your selective permeability lab write-up.

Click here for the tutorial that we will go through together as a class at the end of the period :)

Cellular Respiration, Diffusion & Osmosis, oh my! ;)

Lots and lots to do today!

1. Set up your seeds in the Vernier containers with CO₂ probes, and the labquest (make sure you adjust the time to take data for 25 minutes)
2. Discuss the rate of diffusion lab (Ok to turn in on the block day next week)
3. Groups on canvas (remember your group #)
4. Discuss the selectively permeable membrane lab

Cellular Respiration & Photosynthesis (and a bit of review from cellular transport)

On a whiteboard. . .

• brainstorm everything you know about photosynthesis, aerobic respiration and anaerobic respiration.
• List three things in your life that depend on the metabolism (photosynthesis or respiration) of another type of organism

Today we are going to set up multiple labs.

• Lab #1 -- diffusion across a selectively permeable membrane
• Lab #2 -- Cell Respiration with seeds
• Lab #3 -- What effects the rate of respiration of baking yeast?

We also need to clean up last weeks lab.  Place test tubes into a beaker in the warm water bath to melt the agar.  Pour agar into baggie and throw in the trash.  Wash all test tubes with hot, soapy water.

Work Day Friday

Please use today to work on

• Enzyme lab (due today) remember that the pineapple and pudding activities should be added into your evidence section in the conclusion (look at the rubric!)
• Diffusion lab (due next friday)
• Readings of Chapter 4-7

Continuing with Diffusion

Go to Canvas and following the directions for adding dye to your agar test tubes.  
CAUTION: the dye STAINS, be careful!

Diffusion Extravaganza

Welcome back!

What is diffusion and why do we care about it in Biology???


Go to Canvas, and take the "Rate of Diffusion Pre-lab" quiz. It is ok if you aren't sure of the answer, do your best.

Watch demo of diffusion in action, take some notes about what you see to add to your evidence when writing up the lab.

Go back to Canvas for information about the lab.  

Finish Pineapple enzyme activity

Check your pineapple.  

• Did the different types react differently with the jello?  
• How can this help in your conclusion section of your enzyme lab? (enzyme lab can be turned in before break, but is technically due after)

Help clean the room from all of the lab equipment that we have used throughout the quarter
Finish up whatever work needs to be done.

Pineapple enzyme lab continued . . . .

Add the different types of pineapple to your jello.  BEFORE you do, mark where the jello is at in the container (the pineapple and jello are virtually the same color).  Also, make sure that you squeeze the piece of pineapple so there is some juice to interact with the jello.

Once that is complete, work on whatever still needs to be done for quarter grades :)

• water lab
• chem lab
• molecule activities
• molecule quiz
• enzyme quiz