Cell Membranes andTransport

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LAB REPORT

PHOTOS – Include the digital photos

 as attachments or place them right into your report.

Photo #1 -  Take a photo of the results from the osmosis experiment, by placing the 3 bags (after drying the outside) on a piece of white paper as background.  Write HOT, COLD, AMBIENT underneath each bag.  Get close enough to see the different colors.  This photo is after 30 min. (not 60)

Photo #2 – Take a photo of the row of test tubes with the potato strips in them along with the solutions.

Photo #3 -  After 24 hours have elapsed for the potato/sucrose experiment, hold tubes A and B up side by side and take a photo close enough that you can see the difference in the potato7 strips inside. 

Exercise 1: Diffusion

Observations

Data Table 1: Rate of diffusionin differenttemperatures
	ºC	Minutes
Temperature	Initial Temp.	Initial Color	5	10	15	20	25	30	60
Cold
Ambient
Hot

Questions                                                                                                            

A. Writeaone-paragraphanalysisoftheresultsfortheprocedure.Providereasonsforthe

differencesin the rates of diffusionat the differenttemperatures.

B.  Did the sizes of the molecules affecttheir movement?

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C.  What molecules remained inside the bags?  How can you make this determination?  What molecules were able to freely move into the bags?

Exercise 2:osmosis

Observations                                                                                                       

DataTable 2: Potato Mass
ContentsinTest Tube	InitialMass of Two Potato Strips	FinalMass of Two Strips	Mass Difference	% Changein Mass	ClassAverage Percent Changein Mass(if available)
a) DistilledWater
b) 1.0 M Sucrose
c) 0.8 M Sucrose
d) 0.6 M Sucrose
e) 0.4 M Sucrose
f) 0.2 M Sucrose

Questions

A. Describehowthepotatocylinderschangedintheirturgidity.Identifywhichofthesolutions were isotonic, hypertonic, and hypotonic in relationto the potato.

B.  What would happen to a red blood cell placed in distilledwater? Why?

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