Macromolecules

CAUTION: It is important to always use care when handling reagents. For example, iodine will stain clothes and skin so wear gloves, goggles, and a lab coat when using this reagent.

To prepare a 1 M glucose solution, begin by using a stir bar to dissolve 180.2 g of glucose in 500 mL of distilled water, increasing the volume to 1 L once the solute has dissolved in the smaller volume of solvent.

To prepare a 10% cornstarch solution, first use a hotplate to boil 1 L of distilled water.

Then make a paste with 8 g of cornstarch and 10 mL of cold water.

Now, dissolve the cornstarch paste into the boiling water.

To prepare a 10% gelatin solution, combine 1 g of gelatin powder with 1 L of distilled water.

Then, use the hotplate to boil the solution until the gelatin has fully dissolved, taking care not to burn it.

Label four beakers with the appropriate source material name and a corresponding image of the material.

To Beaker A add an “A: Entire Corn Plant” label and image and fill the beaker with 250 mL of the glucose solution.

To Beaker B add a “B: Corn Kernel” label and image and fill the beaker with 250 mL of the cornstarch solution.

To Beaker C add a “C: Bone” label and image and fill the beaker with 250 mL of the gelatin solution.

To Beaker D add a “D: Soybean” label and image and fill the beaker with 250 mL of vegetable oil.

Then, cover the beakers with laboratory film until the activity begins.