Here's an example of what's due today

Disk diffusion and MIC lab

Mon, Oct 5, 2026 · Week 7 · Genetics of Disease (Medical Interventions)

Today's goal: Run a disk-diffusion test and connect zone of inhibition to minimum inhibitory concentration.

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.

Disk-diffusion data table

Completes: A data table listing each antibiotic, its measured zone of inhibition in millimeters, and an effectiveness ranking, with a sentence connecting zone size to minimum inhibitory concentration.

Connection to MIC: a larger zone of inhibition means the antibiotic stopped bacterial growth even where it had spread thin and dilute, which points to a lower minimum inhibitory concentration (less drug needed to work).

Ranking: Antibiotic C (22 mm) was most effective, then A (18 mm), then B (9 mm).

Antibiotic	Zone of inhibition (mm)	Effectiveness rank
Antibiotic C	22	1 (most effective)
Antibiotic A	18	2
Antibiotic B	9	3 (least effective)

Also due today: Bring data table to Thursday's resistance analysis; photograph plate for portfolio.

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: CulturingSelf-check skill: Relating zone of inhibition to antibiotic effectiveness and MIC

In a Kirby-Bauer disk-diffusion test, antibiotic disk X produces a 24 mm clear zone and disk Y produces a 7 mm clear zone on the same bacterial lawn. What can you conclude?

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

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