Antibiotics, culturing microorganisms and monoclonal antibodies

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Question 10
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A student investigated the antimicrobial properties of two different plant essential oils using agar plates inoculated with a bacterial culture.

A sterile filter paper disc soaked in essential oil X was placed in the centre of one plate, and a disc soaked in essential oil Y was placed in the centre of the second plate.

The plates were incubated, and the resulting zones of inhibition are shown in the diagram below.

Two circular agar plates showing zones of inhibition around central filter paper discs. The plate on the left, labeled 'Essential oil X', shows a circular zone of inhibition cleared of bacterial growth with a radius of 14 mm. The plate on the right, labeled 'Essential oil Y', shows a smaller circular zone of inhibition with a radius of 10 mm.

Essential oil XEssential oil Y
radius of zone of inhibition = 14 mmradius of zone of inhibition = 10 mm

The area of a circle is calculated using the equation:

Area=πr2 \text{Area} = \pi r^2 Area=πr2

Calculate the area of the zone of inhibition for essential oil X.

Use π=3.14\pi = 3.14π=3.14. Give your answer to 3 significant figures.

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Antibiotics, culturing microorganisms and monoclonal antibodies Questions

  1. GCSE
  2. /Biology
  3. /Antibiotics, culturing microorganisms and monoclonal antibodies