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Bacteria in Milk—Student Laboratory Kits

By: The Flinn Staff

In the Bacteria in Milk Laboratory Kit for microbiology, test refrigerated milk, boiled milk and room temperature milk to determine and compare relative bacterial conditions.

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How much bacteria grows in refrigerated milk? What happens if milk stands out for a day or even for a few hours? Students test refrigerated milk, boiled milk and room-temperature milk to determine and compare their relative bacterial conditions. Students use the resazurin color reaction to demonstrate the relative amounts of bacteria in the various milk samples. Kit materials include the test tubes, powdered milk and the resazurin test solution.

Complete for 30 students working in pairs. Super Value Kit is complete for five classes of 30 students working in pairs.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Analyzing and interpreting data
Planning and carrying out investigations

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
MS-LS1.A: Structure and Function
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Scale, proportion, and quantity

Performance Expectations

MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
MS-LS1-1. Conduct an investigation to provide evidence that living things are made of cells; either one cell or many different numbers and types of cells