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Antibiotics, culturing microorganisms and monoclonal antibodies

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Question 54

An investigation was carried out to compare the effectiveness of two different antibiotics, Antibiotic X and Antibiotic Y, against the growth of E. coli bacteria on agar plates.

Two agar plates showing the results of an antibacterial test comparing Antibiotic X and Antibiotic Y. Plate X on the left has a filter paper disc of Antibiotic X in the centre surrounded by a very wide, clear circular zone of inhibition where no bacterial growth occurs, with the rest of the plate covered in dark grey bacterial lawn. Plate Y on the right has a filter paper disc of Antibiotic Y in the centre surrounded by a much smaller, clear circular zone of inhibition, with the rest of the plate covered in dark grey bacterial lawn.

Table 1: Measurement results for Antibiotic X

Antibiotic X zone of inhibitionValue
Radius (mmmmmm)15
Area (mm2mm^2mm2)707

Explain which antibiotic is the most effective.

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Antibiotics, culturing microorganisms and monoclonal antibodies Questions

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