Microbiology with Diseases by Body System

Robert W. Bauman

Chapter 6

Microbial Nutrition and Growth - all with Video Answers

Educators

Chapter Questions

Problem 1

Which of the following can grow in a Petri plate on a laboratory table?
a. an anaerobic bacterium
c. viruses on an agar surface
b. an aerobic bacterium
d. all of the above

Emily Marty

Emily Marty

Numerade Educator

Problem 2

"In the laboratory, a sterile inoculating loop is moved across the agar surface in a culture dish, thinning a sample and isolating individuals." This statement describes which of the following?
a. broth culture
b. pour plate
c. streak plate
d. dilution plate

Emily Marty

Numerade Educator

Problem 3

Superoxide dismutase __________.
a. causes hydrogen peroxi to become toxic
b. detoxifies superoxide radicals
c. neutralizes singlet oxygen
d. is missing in aerobes

Emily Marty

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Problem 4

The most reactive of the four toxic forms of oxygen is ________________.
a. the hydroxyl radical
b. the peroxide anion
c. the superoxide radical
d. singlet oxygen

Emily Marty

Numerade Educator

Problem 5

Microaerophiles that grow best with a high concentration of carbon dioxide in addition to a low level of oxygen are called _____________.
a. aerotolerant
b. capnophiles
c. facultative anaerobes
d. fastidious

Emily Marty

Numerade Educator

Problem 6

Which of the following is not a growth factor for various microbes?
a. cholesterol
b. water
c. vitamins
d. heme

Emily Marty

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Problem 7

Organisms that preferentially may thrive in icy waters are described as __________________.
a. barophiles
b. thermophiles
c. mesophiles
d. psychrophiles

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Problem 8

Barophiles _____________ .
a. cannot cause diseases in humans
b. live at normal barometric pressure
c. die if put under high pressure
d. thrive in warm air

Emily Marty

Numerade Educator

Problem 9

Which of the following terms best describes an organism that camnot exist in the presence of oxygen?
a. obligate aerobe
b. facultative aerobe
c. obligate anaerobe
d. facultative anaerobe

Emily Marty

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Problem 10

In a defined medium,__________________.
a. the exact chemical composition of the medium is known
b. agar is available for microbial nutrition
c. blood may be included
d. organic chemicals are excluded

Emily Marty

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Problem 11

Which of the following is most useful in representing population growth on a graph?
a. logarithmic reproduction of the growth curve
b. a semilogarithmic graph using a log scale on the $y$ -axis
c. an arithmetic graph of the lag phase followed by a logarithmic section for the log, stationary, and death phases
d. None of the above would best represent a population growth curve.

Emily Marty

Numerade Educator

Problem 12

Which of the following methods is best for counting fecal bacteria from a stream to determine the safety of the water for drinking?
a. dry weight
b. turbidity
c. viable plate counts
d. membrane filtration

Emily Marty

Numerade Educator

Problem 13

A Coulter counter is a(n) _____________.
a. statistical estimation using 15 dilution tubes and a table of numbers to estimate the number of bacteria per milliliter
b. indirect method of counting microorganisms
c. device that directly counts microbes as they pass through a tube in front of an electronic detector
d. device that directly counts microbes that are differentially stained with fluorescent dyes

Emily Marty

Numerade Educator

Problem 14

Lyophilization can be described as ________________.
a. freeze-drying
b. deep-freezing
c. refrigeration
d. pickling

Emily Marty

Numerade Educator

Problem 15

Quorum sensing is ____________.
a. the ability to respond to changes in population density
b. a characteristic allowing secretion of a matrix
c. dependent on direct contact among cells
d. associated with colonies in broth culture

Emily Marty

Numerade Educator