CAIE IGCSE Biology 15.1.3 Antibiotic-resistant Bacteria

Practise recognising antibiotic resistance from treatment outcomes, culture plates and infection data.

Exam points

state that resistant bacteria survive an antibiotic that would normally kill them
use a small or absent clear zone on a culture plate as evidence of resistance
explain that resistance reduces treatment effectiveness and allows infections to persist or spread

[Maximum number: 6]

Bacteria are classified as belonging to the Prokaryote kingdom.

(a)

MRSA is a type of bacterium that is resistant to antibiotics. The number of cases of MRSA identified in hospitals in the USA between 1995 and 2005 was recorded.
Fig. 2.1 shows these data.

Fig. 2.1

[ 6 ]

(i)

Describe the results shown in Fig. 2.1.

[ 2 ]

(ii)

Explain how bacteria become resistant to antibiotics.

[ 4 ]

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15.1.3—Some bacteria are resistant question 1

Question (a)

Question (i)

Question (ii)