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Two types of bacteria were isolated from a patient’s throat swab and grown in pure culture on separate agar plates - HSC - SSCE Biology - Question 7 - 2019 - Paper 1
Question 7
Two types of bacteria were isolated from a patient’s throat swab and grown in pure culture on separate agar plates. On each plate there were FOUR different antibioti... show full transcript
Worked Solution & Example Answer:Two types of bacteria were isolated from a patient’s throat swab and grown in pure culture on separate agar plates - HSC - SSCE Biology - Question 7 - 2019 - Paper 1
Step 1
Identify the Zones of Inhibition for Bacteria A
Answer
For Bacteria A, no significant zones of inhibition are observed around discs W, X, and Y, indicating these antibiotics were ineffective against this strain. However, a clear zone around disc Z suggests that Z is effective at inhibiting the growth of Bacteria A.
Step 2
Identify the Zones of Inhibition for Bacteria B
Answer
In Bacteria B, disc W shows no inhibition, while X also shows significant bacterial growth around it. Disc Y shows a slight zone of inhibition, but the most significant effect is seen with disc Z, which demonstrates a clear zone of inhibition indicating effectiveness against Bacteria B as well.
Step 3