Study Notes
Antibiotic resistance occurs when bacteria change in response to the use of antibiotics, making the drugs less effective.
- Antibiotic Resistance — the ability of bacteria to withstand the effects of an antibiotic. Example: MRSA is a type of bacteria that has become resistant to many antibiotics.
- Mutation — a change in the DNA sequence of an organism. Example: Mutations can lead to antibiotic resistance in bacteria.
- Natural Selection — the process where organisms better adapted to their environment tend to survive and produce more offspring. Example: Bacteria with resistance genes survive antibiotic treatment and reproduce.
Exam Tips
Key Definitions to Remember
- Antibiotic Resistance
- Mutation
- Natural Selection
Common Confusions
- Confusing antibiotic resistance with immunity in humans
- Believing that antibiotics cause mutations rather than selecting for resistant strains
Typical Exam Questions
- What is antibiotic resistance? Antibiotic resistance is when bacteria can survive and grow despite the presence of antibiotics.
- How do mutations contribute to antibiotic resistance? Mutations can create genetic variations that may lead to resistance.
- Why is natural selection important in the development of antibiotic resistance? It allows resistant bacteria to survive and reproduce, spreading resistance.
What Examiners Usually Test
- Understanding of how antibiotic resistance develops
- The role of natural selection in resistance
- Differences between resistance and immunity