CAIE A-Level Biology AS 10.2.3 Antibiotic Resistance Questions
Explain how antibiotic resistance arises and spreads in bacterial populations using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain how antibiotic resistance arises and how it spreads in bacterial populations.
CAIE A-Level Biology AS 10.2.3 Antibiotic Resistance Questions question 1
Fig. 4.1 is a transmission electron micrograph of the bacterium that causes cholera, Vibrio cholerae.
The flagellum shown in Fig. 4.1 allows movement of the bacterium within the gut and may also function to help it to bind to an intestinal epithelial cell. The organism does not enter the cell but the toxin it releases can enter and cause damage. Large quantities of water, chloride ions and sodium ions are lost from the cell.
Fig. 4.1
People with symptoms of cholera have severe watery diarrhoea and as a result can become very dehydrated.
Some strains of V. cholerae are antibiotic resistant.
Explain why this means that medical practitioners prefer to treat cholera with a single dose of antibiotic, rather than a multiple dose of the same antibiotic.
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