Exam 3 Questions MCB3020 Bacusmo
Questions and Answers 100% Accurate
When a disease maintains a relatively steady, low-level frequency at a moderately regular interval, it is
called _________. - ANSWER - an endemic
In the host-parasite relationship, it is advantageous for the parasite to disable and kill its host as quickly
as possible. - ANSWER - False
An organism that is able to be transmitted from one host to another is said to be _________. - ANSWER -
Communicable
Generally, exotoxins tend to be more heat stable than endotoxins. - 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 - ANSWER - commensal.
Which of the following is a physical barrier in the nonspecific defense of a mammalian host? - ANSWER -
Mucous membranes
The condition in the host that results from pathogenic parasitic organism growing and multiplying within
or on the host is called - ANSWER - an infection.
Substances that are recognized as foreign and provoke immune responses are called _________. -
ANSWER - antigens
The first case in an epidemic is called the _________. - ANSWER - Index Case
, Vaccines using inactivated pathogens do not stimulate cell-mediated immunity as effectively as vaccines
using attenuated pathogens. - ANSWER - True
The characteristics of a pathogen that determine its virulence include which of the following? - ANSWER
- Invasiveness
Inefectivity
Pathogenicity
Microorganisms do not generally reproduce sexually; therefore, species are usually defined by
phenotypic and genotypic similarities. - ANSWER - True
A population descending from a single organism or pure culture isolate is called a ______. - ANSWER -
Strain
From which body region would you expect to isolate Clostridium, Bacteroides, Fusobacterium and other
anaerobic genera? - ANSWER - Large intestine
The arrangement of organisms into groups is best described as ______. - ANSWER - classification
Under normal circumstances, which of the following is(are) normally sterile environments in mammals? -
ANSWER - Urinary Bladder
Kidneys
Ureters
rRNA signature sequences can be used to place microorganisms in the correct domain. - ANSWER - true
Although there are other classification schemes for prokaryotes, the one used in Bergey's Manual is
currently considered by most microbiologists to be the most accurate. - ANSWER - true
___________ immunity is an epidemiological concept that explains the resistance of a population to
infection and the spread of an infectious organism due to the immunity of a high percentage of the
population. - ANSWER - Herd
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