Question 1

A chemical that denatures proteins is MOST likely to be classified as a(n)________ agent.

Accepted Answer

A)  antiseptic 
B)  bacteriostatic 
C)  bacteriocidal 
D)  detergent 
A)  antiseptic 
B)  bacteriostatic 
C)  bacteriocidal 
D)  detergent

Question 2

Which of the following methods to enumerate cells often requires specialized staining to observe non-pigmented bacteria?

Accepted Answer

A)  spectrophotometry/turbidity 
B)  spread-plating 
C)  microscopy 
D)  spread-plating, turbidity, and microscopy 
A)  spectrophotometry/turbidity 
B)  spread-plating 
C)  microscopy 
D)  spread-plating, turbidity, and microscopy

Question 3

A bacterium's pH optimum reflects the optimal pH of its intracellular environment.

Accepted Answer

A) True 
 B)False

Question 4

The lag phase does NOT occur if all the cells in the culture are viable.

Accepted Answer

A) True 
 B)False

Question 5

Organisms able to live in environments with high sugar concentrations are

Accepted Answer

A)  halotolerant. 
B)  osmophiles. 
C)  xerophiles. 
D)  anaerobic fermenting bacteria. 
A)  halotolerant. 
B)  osmophiles. 
C)  xerophiles. 
D)  anaerobic fermenting bacteria.

Question 6

What is the function of bactoprenol?

Accepted Answer

A)  It is a hydrophobic alcohol that transports peptidoglycan precursors across the cytoplasmic membrane. 
B)  It is responsible for forming the peptide cross-links between muramic acid residues in adjacent glycan chains. 
C)  It triggers the recruitment of FtsZ and the initiation of the divisome. 
D)  It supplies the energy necessary for transpeptidation to occur. 
A)  It is a hydrophobic alcohol that transports peptidoglycan precursors across the cytoplasmic membrane. 
B)  It is responsible for forming the peptide cross-links between muramic acid residues in adjacent glycan chains. 
C)  It triggers the recruitment of FtsZ and the initiation of the divisome. 
D)  It supplies the energy necessary for transpeptidation to occur.

Question 7

Microbial growth is generally described as the increased number of cells rather than the expanding size of an individual microbial cell.

Accepted Answer

A) True 
 B)False

Question 8

In general,which group is MOST resistant to radiation?

Accepted Answer

A)  microscopic fungi 
B)  viruses 
C)  thermotolerant bacteria 
D)  spore-forming bacteria 
A)  microscopic fungi 
B)  viruses 
C)  thermotolerant bacteria 
D)  spore-forming bacteria

Question 9

A drug targeting ________ would NOT be an effective antibiotic.

Accepted Answer

A)  ZipA 
B)  FtsI 
C)  MreB 
D)  transpeptidation 
A)  ZipA 
B)  FtsI 
C)  MreB 
D)  transpeptidation

Question 10

A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.

Accepted Answer

A)  catalase 
B)  superoxide dismutase 
C)  superoxide reductase 
D)  peroxidase 
A)  catalase 
B)  superoxide dismutase 
C)  superoxide reductase 
D)  peroxidase

Question 11

Knowing the concentration of microorganisms in a sample is often an important consideration for environmental,industrial,and medical microbiologists,yet a microscope is sometimes not used to accomplish this task.Explain five major limitations to using a light microscope to directly count microorganisms.

Accepted Answer

All of the following eight are potential

Question 12

A bacterium that lacks the mreB gene will have a ________ shape.

Accepted Answer

A)  bacillus 
B)  coccoid 
C)  short bacillus 
D)  vibrio 
A)  bacillus 
B)  coccoid 
C)  short bacillus 
D)  vibrio

Question 13

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in psychrophiles.

Accepted Answer

Non-psychrophiles do not thrive in the c

Question 14

Optical density and viable cell concentration are LEAST proportional to each other during

Accepted Answer

A)  lag phase. 
B)  exponential growth phase. 
C)  stationary phase. 
D)  death phase. 
A)  lag phase. 
B)  exponential growth phase. 
C)  stationary phase. 
D)  death phase.

Question 15

Due to the relationship between the rate of enzyme catalysis and temperature,organisms living in boiling hot springs are also rapid growers with fast doubling times.

Accepted Answer

A) True 
 B)False

Question 16

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in thermophiles.

Accepted Answer

Thermophilic proteins typicall

Question 17

In both lag and stationary phase,there is no net increase or decrease in viable cells.

Accepted Answer

A) True 
 B)False

Question 18

A microbe growing in a refrigerator is likely

Accepted Answer

A)  psychrophilic. 
B)  mesophilic. 
C)  psychrotolerant or psychrophilic. 
D)  hyperthermophilic. 
A)  psychrophilic. 
B)  mesophilic. 
C)  psychrotolerant or psychrophilic. 
D)  hyperthermophilic.

Question 19

Which of the following is/are transferred to daughter cells during cell division?

Accepted Answer

A)  genomic DNA, the blueprint for everything the cell needs 
B)  individual genes and enzymes to later be brought together to form the genome 
C)  chromosome and enzymes to immediately begin cellular metabolism 
D)  chromosome, proteins, and all other cellular constituents 
A)  genomic DNA, the blueprint for everything the cell needs 
B)  individual genes and enzymes to later be brought together to form the genome 
C)  chromosome and enzymes to immediately begin cellular metabolism 
D)  chromosome, proteins, and all other cellular constituents

Question 20

The partition that is a result of the inward growth of the cytoplasmic membrane and cell wall from opposing directions is known as the

Accepted Answer

A)  divisome. 
B)  septum. 
C)  autolysin. 
D)  colony. 
A)  divisome. 
B)  septum. 
C)  autolysin. 
D)  colony.

Exam 5: Microbial Growth and Control

A chemical that denatures proteins is MOST likely to be classified as a(n)________ agent.

Which of the following methods to enumerate cells often requires specialized staining to observe non-pigmented bacteria?

A bacterium's pH optimum reflects the optimal pH of its intracellular environment.

The lag phase does NOT occur if all the cells in the culture are viable.

Organisms able to live in environments with high sugar concentrations are

What is the function of bactoprenol?

Microbial growth is generally described as the increased number of cells rather than the expanding size of an individual microbial cell.

In general,which group is MOST resistant to radiation?

A drug targeting ________ would NOT be an effective antibiotic.

A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.

A bacterium that lacks the mreB gene will have a ________ shape.

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in psychrophiles.

Optical density and viable cell concentration are LEAST proportional to each other during

Due to the relationship between the rate of enzyme catalysis and temperature,organisms living in boiling hot springs are also rapid growers with fast doubling times.

Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in thermophiles.

In both lag and stationary phase,there is no net increase or decrease in viable cells.

A microbe growing in a refrigerator is likely

Which of the following is/are transferred to daughter cells during cell division?

The partition that is a result of the inward growth of the cytoplasmic membrane and cell wall from opposing directions is known as the

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