Here's an example of what's due today

Biomolecules and design

Wed, Sep 16, 2026 · Week 4 · Principles of Biomedical Technology (Principles of Biomedical Science)

Today's goal: Identify the four biomolecules and outline an experimental design before the PLTW evidence task.

Learn first

What a finished product looks like

This is a model of the work you should turn in today. Use it to check your own: match the structure and the level of detail, do not copy it. Your data and wording should be your own.

Biomolecule pre-lab design sheet

Completes: A pre-lab planning sheet listing each of the four biomolecule indicator tests with its reagent and expected positive and negative colors, plus a written hypothesis for one test.

Pre-lab design (Lin, Period 1):

Hypothesis: If the unknown sample contains a reducing sugar, then Benedict's solution will change from blue to orange or brick red when heated.

Variables: Independent variable is the sample tested; dependent variable is the color change; controlled variables are reagent amount, heating time, and tube size.

Biomolecule	Indicator	Positive color	Negative color
Reducing sugar	Benedict's	Orange to brick red	Blue
Starch	Lugol's iodine	Blue-black	Yellow-brown
Protein	Biuret	Violet	Blue
Lipid	Sudan IV	Red layer in oil	No red layer

Also due today: Hand in your pre-lab sheet before leaving. Also complete the online evidence-testing and toxicology intro task.

Check yourself

WebXam problem for today's skill

One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.

WebXam-style domain: Biotechnology Research and ExperimentsSelf-check skill: Matching biomolecules to their indicator tests and positive results

A student adds Benedict's solution to an unknown, heats it, and the mixture turns brick red. What does this result indicate?

Tap an answer to see the full explanation. Nothing is recorded or graded.

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