Natural Selection in Action (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Plasmid
Plasmid
Small circular DNA piece carrying resistance genes
3 mechanisms of antibiotic resistance (EPT)
3 mechanisms of antibiotic resistance (EPT)
Enzymatic breakdown, Pump out, Target modification
Penicillinase function
Penicillinase function
Enzyme that cleaves penicillin, rendering it ineffective
Descendants from 1 resistant bacterium in 24h
Descendants from 1 resistant bacterium in 24h
10,000 million
Why mutations have immediate effect in bacteria
Why mutations have immediate effect in bacteria
Bacteria are haploid - only one copy of each gene
Binary fission
Binary fission
Asexual bacterial reproduction - cell divides into two
When was last new antibiotic class discovered?
When was last new antibiotic class discovered?
1980s (no new class since)
Monoculture
Monoculture
Growing single crop species over large areas
Selective agent
Selective agent
Environmental factor influencing survival & reproduction
Integrated pest management
Integrated pest management
Multiple control strategies to reduce chemical pesticide use