Factors Affecting Bacterial Growth (Leaving Cert Biology): Flashcards
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Practise the cards
13 cards from this deck
5 factors affecting bacterial growth
5 factors affecting bacterial growth
Temp, O2, pH, solute conc., pressure
Optimal temp range for most bacteria
Optimal temp range for most bacteria
25°C-45°C
What controls bacterial growth
What controls bacterial growth
Enzymes
Aerobic bacteria
Aerobic bacteria
Need oxygen to survive for respiration
Obligate anaerobic bacteria
Obligate anaerobic bacteria
Can only respire in absence of oxygen
Facultative anaerobic bacteria
Facultative anaerobic bacteria
Can respire with or without oxygen
Aerotolerant anaerobic bacteria
Aerotolerant anaerobic bacteria
Don't need O2 but can survive in its presence
pH needed by most bacteria
pH needed by most bacteria
Neutral pH
High solute conc. effect on bacteria
High solute conc. effect on bacteria
Water leaves by osmosis; cell shrivels & dies
Low solute conc. & what prevents bursting
Low solute conc. & what prevents bursting
Water enters by osmosis; cell wall prevents bursting
Osmosis
Osmosis
Water movement from high to low conc. across semi-permeable membrane
High pressure effect on bacteria
High pressure effect on bacteria
Inhibits growth; cell walls collapse
Respiration
Respiration
Enzyme-controlled release of energy from food