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MICROBIO LEC > Microbial Growth > Flashcards

Microbial Growth Flashcards

1
Q

How fast does S. aureus grow?

A

27-30 mins.

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2
Q

What happens in binary fission?

A

Cell duplication, unilateral growth

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3
Q

Most bacteria divides cell through?

A

Binary fission

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4
Q

True or false. Growth is unequal in budding.

A

True.

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5
Q

Steps in binary fission

A

Single cells -> DNA replication -> septum formation moves down & divides cell

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6
Q

What does a closed culture system do?

A

Provide nutrients

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7
Q

True or false. A single cell that divides into two is considered as two generations.

A

False. One generation only.

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8
Q

3 kinds of cell division

A

Binary fission, budding, and biofilms

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9
Q

Organisms in death phase undergo?

A

Involution to conserve energy (limit nutrient use)

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10
Q

There is an overwhelming amount of toxic waste in this phase

A

Death phase

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11
Q

Describe the toxic environment in stationary phase

A

Highly acidic pH, decrease in oxygen (overall increase in microbial waste)

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12
Q

In budding, (blank) develops from (blank).

A

Daughter, mother

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13
Q

How fast does E.Coli grow?

A

15-18 mins.

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14
Q

Increase in population

A

Exponential

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15
Q

What is produced in biofilms?

A

Polysaccharide matrix

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16
Q

You can determine the generation time of organisms during this phase

A

Exponential phase

17
Q

What forms during death phase in some organisms?

A

Endospores

18
Q

Duration of lag phase depends on?

A

Nutrients available, species

19
Q

No growth but increase in metabolic activity

A

Lag phase

20
Q

Biofilms are?

A

A community of microorganisms that are trapped in slimy material

21
Q

How long does Mycobacterium tuberculosis grow?

A

18-24 hrs.

22
Q

Open system (chemostat) works by?

A

Taking samples at several intervals (usually every hr)

23
Q

Exponential phase may be maintained through?

A

Chemostat

24
Q

How fast does Bacillus subtilis grow?

A

26 mins.

25
Q

True or false. A single cell that divides into two are two generations.

A

False. One generation only.

26
Q

How long does Leptospira sp. grow?

A

6-8 hrs.

27
Q

Factors that govern cell division

A

Dilution rate, concentration of limited nutrients

28
Q

Stages in bacterial growth curve

A

Lag, exponential, stationary, death phase

29
Q

Also called the adjustment d

A

Lag phase

30
Q

Why do we want to maintain exponential phase?

A

Due to increase rate

31
Q

Equal rate of replication and death

A

Stationary

32
Q

Budding allows organisms to?

A

Keep growing and survive environmental conditions

MICROBIO LEC (6 decks)

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