growth curves Flashcards

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1
Q

why are log scales used?

A

bacteria reproduce rapidly so large quantities are obtained rapidly

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2
Q

describe the first phase

A

lag
- constant line before increase

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3
Q

describe the second phase

A

exponential
- increase
- reproduction at max rate

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4
Q

describe the third phase

A

stationary
- constant population
- bacteria from growth and death are equal

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5
Q

describe the fourth phase

A

death
- decrease
- bacteria death exceeds reproductive rate due to toxins or lack of resources

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6
Q

how can death be prevented?

A

manipulating growth conditions to remove limiting factors

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7
Q

state 5 limiting factors

A
  • nutrients
  • oxygen for aerobic respiration
  • temperature to prevent enzyme denature
  • remove toxins
  • buffer pH
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8
Q

how is the number of individual organisms calculated?

A

initial x 2(power divisions/generations)

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