Nimo

Study smarter with Nimo

Personalised revision that adapts to you. Ace your revision with unlimited practice questions that are designed to help you learn faster. We're slowly rolling out to more and more students.

Try Nimo

Antibiotic resistance: evolution and control

Inheritance, variation and evolution • The development of understanding of genetics and evolution

Key concepts

What you'll likely be quizzed about

  • Antibiotic resistance describes the ability of bacteria to survive exposure to an antibiotic that would usually kill them or inhibit their growth.
  • Resistance arises when genetic changes alter bacterial structures or functions targeted by antibiotics, or when bacteria develop mechanisms that inactivate or expel the drug.
  • Resistance does not render bacteria invincible to all treatments; it is specific to particular antibiotics or classes.

Flashcards

Test your knowledge with interactive flashcards

How do random mutations cause resistance?

Click to reveal answer

Random mutations alter bacterial proteins or enzymes so that antibiotics cannot bind, enter, or act effectively, resulting in inheritable resistance.

Key notes

Important points to keep in mind

Resistance arises from genetic changes: mutations and horizontal gene transfer are key mechanisms.

Antibiotic treatment creates selection pressure that favors resistant bacteria, allowing rapid evolution in populations.

MRSA shows how clinical settings intensify selection and transmission, creating challenging outbreaks.

Antibiotic stewardship limits unnecessary use and decreases resistance by reducing selection pressure.

Completing prescribed antibiotic courses minimizes survival of partially resistant bacteria, curbing their spread.

Infection control measures (hand hygiene, antiseptics, cleaning, isolation) reduce transmission opportunities.

Limiting non-therapeutic antibiotic use in agriculture decreases environmental resistance reservoirs.

Development of new antibiotics is slow and expensive, making resistance prevention crucial.

Rapid detection and targeted treatment reduce exposure to broad-spectrum antibiotics and support microbial diversity.

Public health surveillance monitors resistance trends and informs policies to mitigate emergence and spread.

Built with v0