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CAIE IGCSE Biology 15.1 Drugs Question Bank

Practise drug and antibiotic questions by defining drugs, choosing bacterial treatment contexts and interpreting resistance data or culture plates.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • define drugs and distinguish antibiotics from hormones, enzymes and antibodies
  • apply antibiotics to bacterial infections while rejecting viral diseases and pain relief
  • interpret clear zones, MRSA graphs and natural selection in antibiotic resistance

Covered syllabus points

15.1.1—Drug as any substance taken into15.1.2—Use of antibiotics for the treatment15.1.3—Some bacteria are resistant15.1.4—Antibiotics kill bacteria but do not15.1.5—Using antibiotics only when essential

15.1 Drugs question 1

[Maximum number: 2]

Heroin is a drug that acts on the nervous system.

Define the term drug.

15.1 Drugs question 2

[Maximum number: 1]

Fig. 4.1 is a diagram of the human female reproductive system.

Fig. 4.1

Fig. 4.1

Chlamydia is caused by a bacterium.

Suggest a treatment for chlamydia.

15.1 Drugs question 3

[Maximum number: 8]

Bacteria are classified as belonging to the Prokaryote kingdom.

Question (a)

(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

Fig. 2.1

[ 6 ]

Question (i)

(i)

Describe the results shown in Fig. 2.1.

[ 2 ]

Question (ii)

(ii)

Explain how bacteria become resistant to antibiotics.

[ 4 ]

Question (b)

(b)

The number of cases of MRSA has decreased since 2005.

Suggest reasons for this decrease.

[ 2 ]
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