Lesson 6.6.1
6.6.1 Bacteriostatic and bactericidal antibiotics Quiz: Pearson Edexcel Biology, Unit 6
20 questions
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Lesson 6.6.1, Bacteriostatic and bactericidal antibiotics: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 6: Immunity, Infection and Forensics, written with Revision Ninja.
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The 20 questions
-
What is the primary action of a bacteriostatic antibiotic?
- Inhibiting bacterial growth
- Digesting bacterial DNA
- Lysing cell walls
- Directly killing bacteria
-
What term describes an antibiotic that directly kills bacteria?
- Antiviral
- Bacteriostatic
- Bactericidal
- Antifungal
-
What is the primary effect of a bactericidal antibiotic on bacteria?
- It inhibits growth
- It kills bacteria
- It agglutinates cells
- It neutralises toxins
-
What is the primary effect of a bacteriostatic antibiotic on bacteria?
- It kills bacteria
- It hydrolyses DNA
- It lyses membranes
- It inhibits growth
-
In agar disc diffusion, what does a clear zone around an antibiotic disc indicate?
- Bacterial contamination
- Antibiotic breakdown
- Bacterial resistance
- Bacterial sensitivity
-
Which variable must be carefully controlled when comparing antibiotic effectiveness using disc diffusion?
- Bacterial culture concentration
- Incubation temperature only
- Nutrient agar volume
- Antibiotic molecular weight
-
What does a larger zone of inhibition around an antibiotic disc indicate?
- Greater bacterial resistance
- Faster bacterial growth
- Lower drug concentration
- Greater antibiotic effectiveness
-
Which type of antibiotic is essential for treating patients with weakened immune systems?
- Broad-spectrum antiviral
- Antifungal agent
- Bactericidal antibiotic
- Bacteriostatic antibiotic
-
Which group of antibiotics acts by inhibiting peptidoglycan cross-linking in cell walls?
- Tetracyclines
- Sulfonamides
- Macrolides
- Penicillins
-
By which process do resistant bacterial strains become dominant during antibiotic treatment?
- Natural selection
- Active transport
- Artificial selection
- Selective breeding
-
Why might bacteriostatic antibiotics fail to clear infections in immunosuppressed patients?
- Patient cannot clear
- Drug is destroyed
- Bacteria mutate faster
- Toxins accumulate rapidly
-
Which measurement quantifies antibiotic effectiveness in an agar disc diffusion assay?
- Disc mass
- Incubation time
- Zone diameter
- Agar thickness
-
Which factor determines whether a bacteriostatic or bactericidal antibiotic is chosen?
- Gram stain colour
- Agar gel type
- Bacterial cell size
- Patient immune status
-
What genetic change causes bacterial resistance by reducing antibiotic binding?
- Plasmid loss
- Ribosome size doubling
- Target enzyme mutation
- Cell wall thickening
-
Why are standard antibacterial antibiotics completely ineffective against viral infections?
- Proteins block entry
- Viruses are too small
- Mutations occur fast
- Lack target structures
-
How do macrolide antibiotics inhibit bacterial cell growth?
- Disrupting cell membranes
- Inhibiting DNA replication
- Inhibiting cell-wall synthesis
- Blocking protein synthesis
-
Total clear zone diameter is 18 mm around a 6 mm disc. What is the clear zone width?
- 18 mm
- 6 mm
- 3 mm
- 12 mm
-
Which effect on bacteria indicates that an antibiotic is bactericidal rather than bacteriostatic?
- Protein synthesis stops
- Reproduction is inhibited
- Cells are killed
- Cell wall strengthens
-
What is the main reason patients must complete a full course of antibiotics?
- Prevent allergic reactions
- Reduce hospital costs
- Prevent resistant relapses
- Increase drug absorption
-
How do bactericidal antibiotics like streptomycin inhibit bacterial growth?
- Block DNA synthesis
- Inhibit cell wall
- Bind 30S ribosomes
- Disrupt cell membrane
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