Calculating Zone of Inhibition Area Flashcards

1️⃣ Familiarise yourself with the flashcards:

Look through all the flashcards to see what's on both sides.
Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

Look at the question or prompt on each card and try to remember the answer before flipping it over.
Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

PERSONALISED 1-TO-1 TUTORING

Get support with clear explanations, practice and feedback (Ages 5 to 16).

Want an ad-free experience? Subscribe to remove ads

In an antibiotic disc test, what is the zone of inhibition?

It is the clear area around the disc where bacteria have not grown.

To compare how well different antibiotics stop bacteria growing.

We assume the zone of inhibition is a circle.

Area = π × radius².

Divide the diameter by 2 to get the radius.

Measure from one edge of the clear zone, through the centre of the disc, to the opposite edge.

The radius is 9 mm, because radius = diameter ÷ 2.

Use area = π × 7², so area ≈ 3.14 × 49 ≈ 154 mm².

Measure the diameter, divide by 2 to get the radius, then use area = π × radius².

The 28 mm zone has four times the area, because area uses radius squared.

Use square millimetres, written as mm².

Because area shows the whole size of the clear region, not just its width.