Microbiology Final/chapter 4

Front 1

All the bacterial cells that result from the replication of a single organism are said to ba a
a) population
b) pure culture
c) lag culture
d) mutant culture

Back 1

b) culture

Front 2

How many cells are required in order to visualize a colony
a) 10
b) 100
c) 10,000
d) 1,000,000

Back 2

d) 1,000,000

Front 3

Agar is a polysaccharide extracted from
a) algae
b) fungi
c) bacteria
d) protozoans

Back 3

a) algae

Front 4

Prokaryotic cells divide by a process known as
a) conjugation
b) mitosis
c) binary fussion
d) oinary fission
e) binary fission

Back 4

e) binary fission

Front 5

Biofilms
a) are a haphazard mixture of bacteria
b) are polysaccharide-encased community of microorganisms
c) may enhance bioremediation efforts
d) may protect organisms against harmful chemicals
e) B,C, D

Back 5

e) B,C,D

Front 6

the simplist technique for isolation bacteria in growth media is referred to as the
a) pour plate method
b) streak plate method
c) serial dilution method
d) MPN method

Back 6

b) streak plate method

Front 7

During which phase of growth are bacteria most susceptilbe to antibiotics
a) lag
b) stationary
c) exponential (log)
d) decline

Back 7

c) exponential (log)

Front 8

what stage does cell death equal cell reproduction
a) lag
b) log
c) stationary
d) death

Back 8

c) stationary

Front 9

during which phase of the bacterial growth curve does the total number of viable cells decline
a) stationary
b) lag
c) exponential
d) death

Back 9

d) death

Front 10

the lag phase of the bacterial growth curve is marked by
a) a decrease in cell mass
b) dormat, motebolically inactive cells
c) metabiolically active cells
d) vigorously dividing cells

Back 10

c) metabiolically active cells

Front 11

a urine sample with more than 100,000 organisms is considered indicative of infection. If a urine sample containing 5,000 bacteria with a generation time of 30 minutes, sits for 3 hours before finally being assayed, how many bacteria will then be present
a) 10,000
b) 64,000
c) 100,000
d) 320,000

Back 11

d) 320,000

Front 12

In a rapidly multiplying bacterial population, cell numbers increase
a) arithmetically
b) logarithmically
c) geometrically
d) indirectly

Back 12

b) logarithmically

Front 13

a bacteria that requires a neutral ph to survive is classified as a
a) acidophile
b) alkalophile
c) neutrophile
d) halophile

Back 13

c) neutrophile

Front 14

generally the proteins of thermophiles
a) resist denaturation
b) react more efficienntly with DNA
c) are easily denatured
d) do not have a specific amino acid sequence

Back 14

a) resist denaturation

Front 15

a hot tub would most likely contain
a) psychrophiles
b) partiers
c) thermophiles
d) mesophiles

Back 15

c) thermophiles

Front 16

bacteria oh fish caught in the arctic ocean would
a) be psychrophiles
b) be mesophiles
c) continue to grow while the fish is in the refrigerator
d) not grow very well in the refigerator
e) A and C

Back 16

e) A and C

Front 17

organisms that require gaseous oxygen for metobolism are referred to as
a) facultative aerobes
b) obligate aerobes
c) facultative anaerobes
d) microaerophiles

Back 17

b) obligate aerobes

Front 18

obligate anaerobes are able to live in presence of a small amount of oxygen
a) true
b) false

Back 18

b) false

Front 19

organisms that are indifferent to the presence of oxygen and do not use it are
a) aerotolerant anaerobes
b) facultatove anaerobes
c) obligate aerobes
d) microaerophiles

Back 19

a) aerotolerant anaerobes

Front 20

the optimum pH for growth of most speacies of bacteria is
a) ph 5
b) ph 7
c) ph 9
d) ph 6

Back 20

b) ph 7

Front 21

Acidophiles can grow in a ph ranging from 1-5.5
a) true
b) false

Back 21

a) true

Front 22

high concentrations of salt and sugar in foods
a) are useful in preserving the food
b) tend to draw water out of a cell
c) have no effect on water availability
d) A and B

Back 22

d) A and B

Front 23

a bacterium that requires a high concentration of sodium chloride is a halophile
a) true
b) false

Back 23

a) true

Front 24

Carbon, hydrogen, nitrogen, phosphorus, and sulfur may be considered
a) minor elements
b) major elements
c) neutral elements
d) acidic elements

Back 24

b) major elements

Front 25

Trace elements
a) include zinc, copper, and manganese
b) are required in large amounts
c) may be needed for enzyme function
d) are involved in maintaining ph in cell
e) A and C

Back 25

e) A and C

Front 26

Growth factors are
a) compounds that must be synthesized by the organism
b) compounds that must be provided to the organism
c) physical factores such as temperature
d) inorganic molecules

Back 26

b) compounds that must be provided to the organism

Front 27

the prefix photo-indicates that an organism will make use of
a) chemicals
b) organics
c) light
d) inorganics

Back 27

c) light

Front 28

organisms that use organic molecules as their source of carbon are called
a) chemotrophs
b) organoheterotrophs
c) heterotrophs
d) autotrophs

Back 28

c) heterotropohs

Front 29

organisms may derive energy from
a) sunlight
b) metabolizing chemical compounds
c) little tiny AAAAAAAAA batteries
d) temperature gradients
e) A and B

Back 29

e) A and B

Front 30

organisms that use CO2 as their source of carbon are called
a) organotrophs
b) heterotrophs
c) autotrophs
d) chemotrophs

Back 30

c) autotrophs

Front 31

chemoheterotrophs
a) use sunlight as an energy source
b) use pre-formed organic molecules as a carbon source
c) use pre-formed organic molecules as an energy source
d) use inorganic chemicals as an energy source
e) B and C

Back 31

e) B and C

Front 32

plasmolysis occurs when
a) a cell dehydrates
b) a cell overhydrates
c) a cell's cytophasm shrinks from the cell wall
d) A and C

Back 32

d) A and C

Front 33

medically important bacteria are often
a) grown on agar containing blood
b) grown ar 37 degress C
c) grown on agar containging chocolate
d)grown at ph of 5
e) A and B

Back 33

e) A and B

Front 34

a medium that enhances the growth of one particular organism in a mixed population is termed a(n)
a) synthetic medium
b) specific culture medium
c) complex medium
d) selective medium

Back 34

d) selective medium

Front 35

MacConkey agar is
a) a selective agar
b) a differential agar
c) a selective and differential agar
d) used to distinguish between bacteria by the type of hemolysis observed

Back 35

c) selective and differential agar

Front 36

a complex media contains a variety of ingredients and the exact composition is not known
a) true
b) false

Back 36

a) true

Front 37

candle jars are usually used to
a) store candles
b) provide an atmosphere with CO2
c) stimulate the growth of obligate anaerobes
d) prevent the growth of obligate aerobes
e) B and C

Back 37

e) B and C

Front 38

Microaerophilic and anaerobic bacteria can be cultivated (grown) in a candle jar
a) true
b) false

Back 38

b) false

Front 39

The solidifying agent used most successfully in bacterial nutrient media is
a) gelatin
b) peptone
c) agar
d) starch

Back 39

c) agar