BIO2041: Lecture 1

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  • Created by: LMoney
  • Created on: 14-05-14 09:44
how do bacteria divide?
by binary fission- gives exponential increase
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what happens in the lag phase?
organism adapting to its new environment: enzymes synthesised, cells increasing in size but not yet dividing
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what happens in the log phase?
cells undergoing exponential growth with constant specific growth rate and mean generation time. Slope and length of log phase depend on environment and nutrients
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what happens in the stationary phase?
no net increase in cell number: nutrient (or oxygen) exhausted, environment changed (pH), toxic products accumulate
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what happens in the death phase?
cells die (often exponential): no energy, pH damage, toxic products
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why might bacterial growth be reduced in solid medium compared to liquid medium?
due to access to nutrients
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review: what are the 4 stages of bacterial growth?
lag, log, stationary, death
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how do fungi grow?
asexually by increasing length, diameter and number of hyphae and hyphal branches
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what does a growth curve look like if taking diameter as the measure of growth?
similar growth curve to that for bacteria
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what is the usual limitation for fungal growth?
tends to be physical – reach edge of growth surface
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what else do fungi produce as part of sexual reproduction and growth?
sporangia
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what are sporangia?
an enclosure in which spores are formed- it can be composed of a single cell or can be multicellular
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how does yeast grow?
by budding – buds do not always separate to become free cells but may chain
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Card 2

Front

what happens in the lag phase?

Back

organism adapting to its new environment: enzymes synthesised, cells increasing in size but not yet dividing

Card 3

Front

what happens in the log phase?

Back

Preview of the front of card 3

Card 4

Front

what happens in the stationary phase?

Back

Preview of the front of card 4

Card 5

Front

what happens in the death phase?

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