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Bacteria in Milk—Student Laboratory Kits

By: The Flinn Staff

Bacteria in Milk Laboratory Kit for Microbiology
Bacteria in Milk Laboratory Kit for Microbiology
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
Constructing explanations and designing solutions
Developing and using models

Disciplinary Core Ideas

MS-LS1.C: Organization for Matter and Energy Flow in Organisms
MS-LS2.B: Cycle of Matter and Energy Transfer in Ecosystems
MS-PS3.D: Energy in Chemical Processes and Everyday Life
HS-LS1.C: Organization for Matter and Energy Flow in Organisms
HS-LS2.B: Cycle of Matter and Energy Transfer in Ecosystems
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Structure and function
Energy and matter

Performance Expectations

MS-LS2-3: Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.
MS-LS1-7: Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism
HS-LS1-7: Use a model to illustrate that cellular respiration is a chemical process whereby the bonds of food molecules and oxygen molecules are broken and the bonds in new compounds are formed, resulting in a net transfer of energy.
HS-LS2-4: Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem.
HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.