Ch 5 - Microbial Growth Flashcards Preview

Microbiology - Biol3880 > Ch 5 - Microbial Growth > Flashcards

Flashcards in Ch 5 - Microbial Growth Deck (39)
1

cell division following enlargement of a cell to twice its minimum size

Binary fission

2

forms ring around center of cell

ftsZ

3

major shape-determining factor in prokaryotes

mreB

4

Forms simple cytoskeleton in Bacteria and probably Archaea

mreB

5

Localizes synthesis of new peptidoglycan and other cell wall components to specific locations along the cylinder of a rod-shaped cell during growth

mreB

6

in _____, cell walls grow in opposite directions outward from the FtsZ ring

Cocci

7

in _________, growth occurs at several points along length of the cell

rod-shaped cells

8

where two daughter cells begin to separate

septum

9

these are the most important proteins in cell division

FTS Proteins (ftsZ, in particular)

10

small openings in the wall are created by _______.

autolysins

11

junction between new and old peptidoglycan

wall band

12

next to last step in cell wall synthesis

Transglycosylation

13

final step in cell wall synthesis

Transpeptidation

14

Forms the carbohydrate cross-links

transglycosylation

15

Forms the peptide cross-links between muramic acid residues in adjacent glycan chains

transpeptidation

16

time required for microbial cells to double in number

generation time

17

growth of a microbial population in which cell numbers double within a specific time interval

exponential growth

18

a closed-system microbial culture of fixed volume

batch culture

19

an open-system microbial culture of fixed volume

continuous culture

20

most common type of continuous culture device

chemostat

21

in ______ culture, it is impossible to independently control both growth parameters

batch

22

uses laser beams, fluorescent dyes, and electronics to measure # of live and dead cells

flow cytometry

23

the (higher/lower) the Opitical Density in a spectrophotometer reading, the more bacterial growth

higher

24

the minimum, optimum, and maximum temperatures at which an organism grows

cardinal temperatures

25

low temperature microorganisms

psychrophile

26

midrange temperature microorganisms

mesophile

27

high temperature microorganisms

thermophile

28

very high temperature microorganisms

Hyperthermophile

29

organisms that grow best at low pH (<6)

acidophiles

30

organisms that grow best at high pH (>9)

alkaliphiles

31

organisms that grow best at reduced water potential

halophiles

32

organisms that require high levels (15–30%) of NaCl for growth

extreme halophiles

33

organisms that can tolerate some reduction in water activity of environment but generally grow best in the absence of the added solute

halotolerant

34

organisms that can tolerate some reduction in water activity of environment but generally grow best in the absence of the added solute

aerobes

35

do not require oxygen and may even be killed by exposure

anaerobes

36

can live with or without oxygen

facultative organisms

37

can tolerate oxygen and grow in its presence even though they cannot use it

aerotolerant anaerobes

38

can use oxygen only when it is present at levels reduced from that in air

microaerophiles

39

Complex medium that separates microbes based on oxygen requirements

thioglycolate broth