Chapter 6- Microbial Growth Flashcards Preview

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Flashcards in Chapter 6- Microbial Growth Deck (44):
0

Increase number of cells but not size

Microbial growth

1

Microbial growth Cells can be ____ from colonies

Isolated

2

Microbial growth is ____ on the growth conditions

dependant

3

Requirements for growth

Physical, chemical

4

Physical requirements for growth

Temp, pH, osmotic pressure

5

Chemical requirements for growth

Carbon, nitrogen, sulfur, phosphorus, trace elements, O2, organic growth factor

6

Room temp

Mesophiles

7

Below 0

Psychrophiles

8

0-30

Psychrotrophs

9

40-70

Thermophiles

10

70 and above

Hyperthermophiles

11

Hypertonic environments or an increase in salt or sugar cause

Plasmolysis

12

Hypotonic environments cause

Cell rupture

13

Backbone of organic molecules

Carbon

14

Primary component or proteins

Nitrogen

15

Protein component

Sulfur

16

In DNA, RNA, ATP, and membranes

Phosphorus

17

Organic compounds obtained from the environment
Vitamins, amino acids, purines, and pyrimidines

Organic growth factors

18

In plaque on teeth

Biofilms

19

Microbial communities
Form slime or hydrogels
Share nutrients
Sheltered from harmful factors

Biofilms

20

Bacteria is attracted by chemicals via

Quorum sensing

21

How do eukaryotes grow

Mitosis, meiosis, and binary fission

22

How do bacteria and archaea grow

Binary fission

23

Cell elongation and DNA replication
CW/ plasma membrane constriction
Cross wall formation(separate/isolate DNA)
Cell separation

Binary fission

24

Nutrients prepare for microbial growth

Culture medium

25

No living microbes

Sterile

26

Introduction of microbes into medium

Inoculum

27

Microbes growling in/on culture medium

Culture

28

Complex polysaccharide
Used as solidifying agent for culture media
Generally not metabolized by microbes
Liquefies at 100C and solidifies at 40C

Agar

29

Exact chemical composition

Chemically defined media

30

Extant ya an digests of yeasts, meat, or plants

Complex media

31

Contain chemicals that combine O2
Heated to drive off O2
Anaerobic

Reducing media

32

Make it easy to distinguish colonies or different microbes

Differential media

33

Suppress some unwanted microbes and encourage desired microbes

Selective media

34

A pure culture contains only ____ species or strain

One

35

A ___ is a population of cells arising from a single cell or spire or from a group of attached cells

Colony

36

A colony is often called a

Colony forming unit

37

The _____ is used to isolate pure cultures

Streak plate method

38

Binary fission
Budding
Conidiospores
Fragmentation

Reproduction in prokaryotes

39

Bacterial growth curve order

Lag
Log
Stationary
Death

40

Intense activity preparing for population growth but no increase in population

Lag phase

41

Exponential increase in population

Log phase

42

Period of equilibrium-microbial deaths balance production of new cells

Stationary phase

43

Population is decreasing at a logarithmic rate

Death phase