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Agenda Catalyst Pre-lab Questions Objective

Catalyst: (Put this in the top margin above the first page of your lab) Describe what a ‘sugar rush’ feels like in your body after you eat a lot of candy. Think about how your brain responds? Heart? Stomach? Etc…. Agenda Catalyst Pre-lab Questions Objective

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Agenda Catalyst Pre-lab Questions Objective

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  1. Catalyst: (Put this in the top margin above the first page of your lab)Describe what a ‘sugar rush’ feels like in your body after you eat a lot of candy. Think about how your brain responds? Heart? Stomach? Etc… Agenda Catalyst Pre-lab Questions Objective Follow simple experimental design to investigate how membranes affect the molecular movement.

  2. Background • Please read the background information on the first page of your lab. • Annotate important information as you see appropriate.

  3. In your lab…. • You will make a model of a cell • Investigate the permeability if DYALYSIS TUBING to starch. • Starch is a carbohydrate, carbohydrates are made out of sugar • Write a one sentence purpose for the lab at the bottom of pg. 2 • Your lab group will decide if starch will go in the internal environment of your ‘cell’ or get poured around external environment of your ‘cell’ • Identify the independent variable on pg. 2 (hint: What are you manipulating?)

  4. Two options… Water Starch Water Starch

  5. The starch will either DIFFUSE through the membrane or it wont. • We will use indicators to look for the presence of the starch • Osmosis will also influence the mass of the cell so you will also measure the initial and final mass. • Identify the dependent variable for this lab on pg. 2 (Hint: What are you measuring?)

  6. With your lab group…. Pg. 2-5 • Assign roles for the lab • Decide if starch will be in the interior or exterior environment of your cell model • Write a hypothesis that starts “ If starch is in the _________ environment, and the dialysis tubing is permeable to starch, then_____________________ because diffusion will________________________. • Identify your control group • Identify your controlled variables • Complete part B ‘review of literature’ book pgs. 3-4 (PLEASE DO NOT DO GLUCOSE or BENIDICTS SOLUTION) (book pg. 162) • Explain the concepts on pg. 5 (Book pgs. 222-224)

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