Question 1

Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur may be considered

Accepted Answer

A)  minor elements. 
B)  major elements. 
C)  neutral elements. 
D)  acidic elements. 
A)  minor elements. 
B)  major elements. 
C)  neutral elements. 
D)  acidic elements.

Question 2

Biofilms

Accepted Answer

A)  are a haphazard mixture of bacteria. 
B)  are a polysaccharide-encased community of microorganisms. 
C)  may enhance bioremediation efforts. 
D)  may protect organisms against harmful chemicals. 
E)  are a polysaccharide-encased community of microorganisms, may enhance bioremediation efforts AND may protect organisms against harmful chemicals. 
A)  are a haphazard mixture of bacteria. 
B)  are a polysaccharide-encased community of microorganisms. 
C)  may enhance bioremediation efforts. 
D)  may protect organisms against harmful chemicals. 
E)  are a polysaccharide-encased community of microorganisms, may enhance bioremediation efforts AND may protect organisms against harmful chemicals.

Question 3

The optimal temperature for most human pathogens might be expected to range from

Accepted Answer

A)  35-40°C. 
B)  20-45°C. 
C)  15-25°C. 
D)  93-98.6°C. 
A)  35-40°C. 
B)  20-45°C. 
C)  15-25°C. 
D)  93-98.6°C.

Question 4

Small organic molecules that must be provided to bacteria in order for them to grow are called

Accepted Answer

A)  minerals. 
B)  growth factors. 
C)  water. 
D)  vitamins. 
A)  minerals. 
B)  growth factors. 
C)  water. 
D)  vitamins.

Question 5

There are 5 stages of growth in an open system of culture.

Accepted Answer

A) True 
 B)False

Question 6

Medically important bacteria are often

Accepted Answer

A)  grown on agar containing blood. 
B)  grown at 37°C. 
C)  grown on agar containing chocolate. 
D)  grown at a pH of 5. 
E)  grown on agar containing blood AND grown at 37°C. 
A)  grown on agar containing blood. 
B)  grown at 37°C. 
C)  grown on agar containing chocolate. 
D)  grown at a pH of 5. 
E)  grown on agar containing blood AND grown at 37°C.

Question 7

An organism called Bacillus fastidiosus

Accepted Answer

A)  might be expected to be very flexible as to growth requirements. 
B)  might be expected to be very strict as to its growth requirements. 
C)  would probably be grown on a chemically defined media. 
D)  might be expected to have a rod shape. 
E)  might be expected to be very strict as to its growth requirements, would probably be grown on a chemically defined media AND might be expected to have a rod shape. 
A)  might be expected to be very flexible as to growth requirements. 
B)  might be expected to be very strict as to its growth requirements. 
C)  would probably be grown on a chemically defined media. 
D)  might be expected to have a rod shape. 
E)  might be expected to be very strict as to its growth requirements, would probably be grown on a chemically defined media AND might be expected to have a rod shape.

Question 8

Organisms that require gaseous oxygen for metabolism are referred to as

Accepted Answer

A)  facultative aerobes. 
B)  obligate aerobes. 
C)  facultative anaerobes. 
D)  microaerophiles. 
A)  facultative aerobes. 
B)  obligate aerobes. 
C)  facultative anaerobes. 
D)  microaerophiles.

Question 9

High concentrations of salt and sugar in foods

Accepted Answer

A)  are useful in preserving the food. 
B)  tend to draw water out of a cell. 
C)  tend to force water into a cell, causing plasmolysis. 
D)  have no effect on water availability. 
E)  are useful in preserving the food AND tend to draw water out of a cell. 
A)  are useful in preserving the food. 
B)  tend to draw water out of a cell. 
C)  tend to force water into a cell, causing plasmolysis. 
D)  have no effect on water availability. 
E)  are useful in preserving the food AND tend to draw water out of a cell.

Question 10

You are working in a clinical laboratory in a hospital setting. You're handed a throat swab from a patient. You are told specifically that the physician is only interested in what Gram positive cells are present. What might you do first to go about working towards this goal? Identification isn't the main goal here-just a first step to work towards determining what Gram positive cells might be there.

Accepted Answer

A)  Perform a Gram stain. 
B)  Streak the sample for isolation on a tryptic soy agar general purpose medium plate. 
C)  Streak the sample for isolation on a medium that is selective for Gram positive cells while suppressing Gram negative cell growth. 
D)  Grow the microbes on the swab by inoculating a tryptic soy broth liquid medium tube. 
E)  Perform an acid-fast stain. 
A)  Perform a Gram stain. 
B)  Streak the sample for isolation on a tryptic soy agar general purpose medium plate. 
C)  Streak the sample for isolation on a medium that is selective for Gram positive cells while suppressing Gram negative cell growth. 
D)  Grow the microbes on the swab by inoculating a tryptic soy broth liquid medium tube. 
E)  Perform an acid-fast stain.

Question 11

During which phase of growth are bacteria most susceptible to antibiotics?

Accepted Answer

A)  lag 
B)  stationary 
C)  exponential (log) 
D)  decline 
A)  lag 
B)  stationary 
C)  exponential (log) 
D)  decline

Question 12

All the bacterial cells that result from the replication of a single original bacterial organism are said to be a

Accepted Answer

A)  population. 
B)  pure culture. 
C)  lag culture. 
D)  mutant culture. 
A)  population. 
B)  pure culture. 
C)  lag culture. 
D)  mutant culture.

Question 13

Products which limit pH changes are often incorporated into media and are referred to as

Accepted Answer

A)  enzymes. 
B)  bases. 
C)  buffers. 
D)  acids.
Learning Outcome: 04.12
Section: 04.07 
A)  enzymes. 
B)  bases. 
C)  buffers. 
D)  acids.
Learning Outcome: 04.12
Section: 04.07

Question 14

The speed of enzymatic reactions approximately doubles for each

Accepted Answer

A)  5° C rise in temperature. 
B)  10° C rise in temperature. 
C)  20° C rise in temperature. 
D)  30° C rise in temperature. 
A)  5° C rise in temperature. 
B)  10° C rise in temperature. 
C)  20° C rise in temperature. 
D)  30° C rise in temperature.

Question 15

Which of the following is/are obligate aerobes?

Accepted Answer

A)  Clostridium botulinum 
B)  Escherichia coli 
C)  Micrococcus luteus 
D)  Helicobacter pylori 
A)  Clostridium botulinum 
B)  Escherichia coli 
C)  Micrococcus luteus 
D)  Helicobacter pylori

Question 16

Agar

Accepted Answer

A)  is a useful nutrient source for most bacteria. 
B)  is a hydrolysate of proteins. 
C)  stays liquid through the typical range of incubation temperatures. 
D)  has chemical and physical properties that make it almost ideal for solidifying media. 
A)  is a useful nutrient source for most bacteria. 
B)  is a hydrolysate of proteins. 
C)  stays liquid through the typical range of incubation temperatures. 
D)  has chemical and physical properties that make it almost ideal for solidifying media.

Question 17

Late log phase of the bacterial growth curve

Accepted Answer

A)  is marked by the production of primary metabolites. 
B)  is marked by the production of secondary metabolites. 
C)  is a transition into the death phase. 
D)  shows a decline in cell numbers. 
A)  is marked by the production of primary metabolites. 
B)  is marked by the production of secondary metabolites. 
C)  is a transition into the death phase. 
D)  shows a decline in cell numbers.

Question 18

The prefix photo- indicates that an organism will make use of _______ for energy purposes.

Accepted Answer

A)  chemicals 
B)  organics 
C)  light 
D)  inorganics 
A)  chemicals 
B)  organics 
C)  light 
D)  inorganics

Question 19

A single bacterial cell may multiply to form a visible colony.

Accepted Answer

A) True 
 B)False

Question 20

You are a microbiologist working for a pharmaceutical company and discover a new secreted metabolite that can serve as a medication. Your company asks you to oversee the production of the metabolite. Which of the following is something that is NOT important to consider if you need to grow 5,000 liter cultures of bacteria for the purpose of harvesting the metabolite they secrete?

Accepted Answer

A)  The death rate of the bacteria after stationary phase is complete. 
B)  The ideal rate of input of new nutrients into the culture to maintain the cells in log phase. 
C)  The ideal rate of pulling off some of the culture in order to maintain the cells in log phase. 
D)  The best way to mix the large vat in order to keep it homogenous (constant throughout) in terms of nutrients, temperature, and oxygen levels. 
E)  The best way to keep the pH of the entire mixture at the ideal level to promote log phase growth. 
A)  The death rate of the bacteria after stationary phase is complete. 
B)  The ideal rate of input of new nutrients into the culture to maintain the cells in log phase. 
C)  The ideal rate of pulling off some of the culture in order to maintain the cells in log phase. 
D)  The best way to mix the large vat in order to keep it homogenous (constant throughout) in terms of nutrients, temperature, and oxygen levels. 
E)  The best way to keep the pH of the entire mixture at the ideal level to promote log phase growth.

Exam 4: Dynamics of Prokaryotic Growth

Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur may be considered

Biofilms

The optimal temperature for most human pathogens might be expected to range from

Small organic molecules that must be provided to bacteria in order for them to grow are called

There are 5 stages of growth in an open system of culture.

Medically important bacteria are often

An organism called Bacillus fastidiosus

Organisms that require gaseous oxygen for metabolism are referred to as

High concentrations of salt and sugar in foods

During which phase of growth are bacteria most susceptible to antibiotics?

All the bacterial cells that result from the replication of a single original bacterial organism are said to be a

Products which limit pH changes are often incorporated into media and are referred to as

The speed of enzymatic reactions approximately doubles for each

Which of the following is/are obligate aerobes?

Agar

Late log phase of the bacterial growth curve

The prefix photo- indicates that an organism will make use of _______ for energy purposes.

A single bacterial cell may multiply to form a visible colony.

Humans and the Microbial World

The Molecules of Life

Microscopy and Cell Structure

Control of Microbial Growth

Metabolism: Fueling Cell Growth

The Blueprint of Life, From Dna to Protein

Bacterial Genetics

Biotechnology and Recombinant Dna

Identification and Classification of Prokaryotes

The Diversity of Prokaryotic Organisms

The Eukaryotic Members of the Microbial World

Viruses, Viroids and Prions

The Innate Immune Response

The Adaptive Immune Response

Host-Microbe Interactions

Immunologic Disorders

Applications of Immune Responses

Epidemiology

Antimicrobial Medications

Respiratory System Infections

Skin Infections

Wound Infections

Digestive System Infections

Genitourinary Infections

Nervous System Infections

Blood and Lymphatic Infections

Hiv Disease and Complications of Immunodeficiency

Microbial Ecology

Environmental Microbiology: Treatment of Water, Wastes, and Polluted Habitats

Food Microbiology

Filters