Growth Curve (Leaving Cert Biology): Flashcards
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Practise the cards
15 cards from this deck
How microbial population growth is measured
How microbial population growth is measured
Counting cells at fixed intervals
Definition of agar
Definition of agar
Solid jelly from seaweed, rich in nutrients, growth medium
Organisms the bacterial growth curve applies to
Organisms the bacterial growth curve applies to
Bacteria and fungi
5 phases of bacterial growth curve
5 phases of bacterial growth curve
Lag, Log, Stationary, Decline, Survival
Lag phase: what bacteria are doing
Lag phase: what bacteria are doing
Adjusting to their environment
Lag phase: what bacteria produce for digestion
Lag phase: what bacteria produce for digestion
Enzymes to digest nutrients
Log phase: cell division rate
Log phase: cell division rate
Maximum
Log phase: population change
Log phase: population change
Grows rapidly
Stationary phase: why growth slows
Stationary phase: why growth slows
Nutrients run out, waste products build up
Example waste product in stationary phase
Example waste product in stationary phase
from respiration
Stationary phase: production vs death rate
Stationary phase: production vs death rate
Equal
Decline phase: conditions causing decline
Decline phase: conditions causing decline
Nutrients almost gone, high toxin levels
Decline phase: death vs reproduction rate
Decline phase: death vs reproduction rate
Death much higher than reproduction
What bacteria form in unfavourable conditions
What bacteria form in unfavourable conditions
Endospores
Definition of endospore
Definition of endospore
Thick-walled, tough, dormant, dehydrated bacterial cell