Exam 3 Questions MCB3020 Bacusmo
UPDATED ACTUAL Questions and
CORRECT Answers
When a disease maintains a relatively steady, low-level frequency at a moderately regular
interval, it is called _________. - CORRECT ANSWER - an endemic
In the host-parasite relationship, it is advantageous for the parasite to disable and kill its host as
quickly as possible. - CORRECT ANSWER - False
An organism that is able to be transmitted from one host to another is said to be _________. -
CORRECT ANSWER - Communicable
Generally, exotoxins tend to be more heat stable than endotoxins. - CORRECT
ANSWER - False, endotoxin is lipid/more heat stable
When Nitrobacter utilizes nitrite produced from ammonia by Nitrosomonas to obtain energy by
converting the nitrite to nitrate, the relationship between the two organisms is - CORRECT
ANSWER - commensal.
Which of the following is a physical barrier in the nonspecific defense of a mammalian host? -
CORRECT ANSWER - Mucous membranes
The first case in an epidemic is called the _________. - CORRECT ANSWER - Index
Case
Vaccines using inactivated pathogens do not stimulate cell-mediated immunity as effectively as
vaccines using attenuated pathogens. - CORRECT ANSWER - True
The characteristics of a pathogen that determine its virulence include which of the following? -
CORRECT ANSWER - Invasiveness
, Inefectivity
Pathogenicity
Microorganisms do not generally reproduce sexually; therefore, species are usually defined by
phenotypic and genotypic similarities. - CORRECT ANSWER - True
A population descending from a single organism or pure culture isolate is called a ______. -
CORRECT ANSWER - Strain
From which body region would you expect to isolate Clostridium, Bacteroides, Fusobacterium
and other anaerobic genera? - CORRECT ANSWER - Large intestine
The condition in the host that results from pathogenic parasitic organism growing and
multiplying within or on the host is called - CORRECT ANSWER - an infection.
Substances that are recognized as foreign and provoke immune responses are called _________.
- CORRECT ANSWER - antigens
The arrangement of organisms into groups is best described as ______. - CORRECT
ANSWER - classification
Under normal circumstances, which of the following is(are) normally sterile environments in
mammals? - CORRECT ANSWER - Urinary Bladder
Kidneys
Ureters
rRNA signature sequences can be used to place microorganisms in the correct domain. -
CORRECT ANSWER - true
UPDATED ACTUAL Questions and
CORRECT Answers
When a disease maintains a relatively steady, low-level frequency at a moderately regular
interval, it is called _________. - CORRECT ANSWER - an endemic
In the host-parasite relationship, it is advantageous for the parasite to disable and kill its host as
quickly as possible. - CORRECT ANSWER - False
An organism that is able to be transmitted from one host to another is said to be _________. -
CORRECT ANSWER - Communicable
Generally, exotoxins tend to be more heat stable than endotoxins. - CORRECT
ANSWER - False, endotoxin is lipid/more heat stable
When Nitrobacter utilizes nitrite produced from ammonia by Nitrosomonas to obtain energy by
converting the nitrite to nitrate, the relationship between the two organisms is - CORRECT
ANSWER - commensal.
Which of the following is a physical barrier in the nonspecific defense of a mammalian host? -
CORRECT ANSWER - Mucous membranes
The first case in an epidemic is called the _________. - CORRECT ANSWER - Index
Case
Vaccines using inactivated pathogens do not stimulate cell-mediated immunity as effectively as
vaccines using attenuated pathogens. - CORRECT ANSWER - True
The characteristics of a pathogen that determine its virulence include which of the following? -
CORRECT ANSWER - Invasiveness
, Inefectivity
Pathogenicity
Microorganisms do not generally reproduce sexually; therefore, species are usually defined by
phenotypic and genotypic similarities. - CORRECT ANSWER - True
A population descending from a single organism or pure culture isolate is called a ______. -
CORRECT ANSWER - Strain
From which body region would you expect to isolate Clostridium, Bacteroides, Fusobacterium
and other anaerobic genera? - CORRECT ANSWER - Large intestine
The condition in the host that results from pathogenic parasitic organism growing and
multiplying within or on the host is called - CORRECT ANSWER - an infection.
Substances that are recognized as foreign and provoke immune responses are called _________.
- CORRECT ANSWER - antigens
The arrangement of organisms into groups is best described as ______. - CORRECT
ANSWER - classification
Under normal circumstances, which of the following is(are) normally sterile environments in
mammals? - CORRECT ANSWER - Urinary Bladder
Kidneys
Ureters
rRNA signature sequences can be used to place microorganisms in the correct domain. -
CORRECT ANSWER - true
