BBC - Science with Mr. Louie

BBC - Science with Mr. Louie

Macromolecule Tests Will a potato turn dark purple with an iodine starch test? Starch Test -Iodine is used to test for starch -Dark purple/blue or black if starch is present (positive) -Stays brown if starch is not present (negative)

Macromolecule Tests Will ground up meat turn violet with a Biurets test? Protein Test -Biurets is used to test for proteins -light purple/violet if proteins are present (positive) -stays light blue if proteins are not present (negative) Macromolecule Tests

Will a soda turn yellow with a Benedicts test? Will a diet soda turn yellow with a Benedicts test? Glucose Test -Benedicts tests for glucose after being heated -Red, yellow, or orange if glucose is present (positive) -Stays light blue if glucose is not present (negative)

Macromolecule Tests Will butter turn a paper bag translucent? Lipid Test -Sudan IV is used to test for lipids -Red if lipids are present (positive) -Stays clear if lipids are not present (negative) -Brown paper bag can be used -Turns translucent if lipids are present (positive) -Remains opaque if lipids are not present (negative)

Macromolecule Tests Test for Malted Barley If you saw the results of the test above for malted barley, what would you say is present in that malted barley? Explain your reasoning. Example: I know that __(macromolecule)__ is present/not present because the __(test)__, which tests for __(macromolecule)__, is __(color)__, which means that __(macromolecule)__ is present/not present.

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