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MCB 3020 Exam 3 Questions with Complete Solutions
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An inanimate object that may be contaminated with a pathogen is called a ________. - Answer-fomite Generally, exotoxins tend to be more heat stable than endotoxins. - Answer-false A disease will be ____________ likely to circulate in a community with a high percentage of individuals who are i...

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  • October 9, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • mcb 3020 exam 3 questions with complete solutions
  • an inanimate object that may be contaminated with

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MCB 3020 Exam 3 Questions with
Complete Solutions
An inanimate object that may be contaminated with a pathogen is called a ________. -
Answer-fomite

Generally, exotoxins tend to be more heat stable than endotoxins. - Answer-false

A disease will be ____________ likely to circulate in a community with a high
percentage of individuals who are immune to the disease. - Answer-less

A bacterial genus that is found in large numbers in the intestinal tract of breast-fed
infants is - Answer-Bifidobacteria

The characteristics of a pathogen that determine its virulence include which of the
following? - Answer-All of the choices are correct.
(Invasiveness, Pathogenicity, Infectivity)

When members of the normal microbiota of the human body become pathogenic and
produce disease under certain circumstances, they are referred to as ______________
pathogens. - Answer-opportunistic

When a disease maintains a relatively steady, low-level frequency at a moderately
regular interval, it is called _________. - Answer-an endemic

The skin surface is a very favorable environment for colonization by most
microorganisms. - Answer-false

Bacteria within biofilms exchange - Answer-All of the choices are correct. (plasmids,
quorum-sensing molecules, nutrients)

The innate response resists a particular foreign agent; moreover, innate immune
responses improve on repeated exposure to the agent. - Answer-false

The first epidemiologist was _________. - Answer-John Snow

Which of the following is considered to be a biological defense mechanism? - Answer-
Normal microbiota

The analysis of genetic relatedness by observing the DNA fragmentation patterns
resulting from restriction endonuclease cleavage is referred to as ______. - Answer-
genetic fingerprinting

, A general term used to describe groups based on mutual similarity or evolutionary
relatedness is ______. - Answer-taxa

Substances that are recognized as foreign and provoke immune responses are called
_________. - Answer-antigens

Active immunization of a population will raise the general level of herd immunity. -
Answer-true

Which of the following public health methods impacted the quality of life through the
20th century by lowering the incidence of many infectious diseases? - Answer-All of the
choices are correct. (Strict sanitation guidelines, Immunizations, Water treatment)

The sudden, unexpected occurrence of a disease in a limited segment of a population is
called a(n) _________. - Answer-outbreak

A researcher proposes that the relationship between a particular bacterial species that
produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following
procedures would best test the researcher's hypothesis? - Answer-Determine which
antibiotic kills the bacteria without harming the host, then administer this antibiotic to the
insect and compare its growth with and without the vitamin

In the host-parasite relationship, it is advantageous for the parasite to disable and kill its
host as quickly as possible. - Answer-False

Under normal circumstances, which of the following is(are) normally sterile
environments in mammals? - Answer-All of the choices are correct.(Urinary bladder,
Ureters, Kidneys)

Macrophages are phagocytic cells. - Answer-true

Microbiota of the skin are most likely to be found - Answer-in association with oil and
sweat glands.

The inhalation of cigarette smoke and similar pollutants has a gradual effect on cilia
lining the respiratory tract, first causing the beating to slow and eventually stop. How
does this change in cilia most directly impact the resistance mechanisms of the host? -
Answer-Innate host immunity due to mechanical barrier protection would be lost

Under normal circumstances, the microbiota of the skin is kept in check by - Answer-a
slightly acidic pH.

Blood cell development occurs in the bone marrow of mammals during the process of
_________. - Answer-hematopoesis

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