The concept of treating all samples, whether known or unknown, as potentially hazardous (or pathogenic) materials is known as _____. correct answers universal precautions
List at least 3 observations a researcher would be sure to note while assessing an unknown microbial sample. correct answers ...
BIOD 171 MODULE 5 EXAM || Already Graded A+.
The concept of treating all samples, whether known or unknown, as potentially hazardous (or
pathogenic) materials is known as _____. correct answers universal precautions
List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample. correct answers size and shape, motility, gram status, color change, chemical
reactions
While observing an unknown sample of limited amounts, a researcher must determine motility
and Gram status using the same sample. What would you determine first and why? correct
answers Motility would be determined before gram status because motility is easily observed on
a wet mount. The sample would need to be killed through heat fixing in order to determine gram
status
A Facultative anaerobe is a microorganism capable of growth under what conditions? correct
answers A microorganism capable of growth under aerobic and anaerobic conditions
As streptococcus is catalase negative would it thrive or die in the presence of peroxides? Why?
correct answers It would die in the presence of peroxides because it is unable to breakdown
peroxides
streptococcus is most often streaked onto: correct answers blood agar
True or False: the Lancefield groups are used to subdivide antigenic groups of alpha-hemolytic
Streptococcus correct answers False
True or False: the Lancefield groups are used to subdivide antigenic groups of gamma-hemolytic
Streptococcus correct answers false
Greater than 90% of all human streptococcal infections belong to (multiple choice) correct
answers group A
The distinctions for Lancefield subgroupings lie in its: (select all that apply) correct answers
Carbohydrate composition of antigens
left untreated, strep throat can progress to___, which displays ___ hemolytic activity. correct
answers Rheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left untreated
correct answers Beta; strep
True or false: under most circumstances, staphylococcus can be found in ~80% of human
population where it remains non-symptomatic correct answers false
, True or false: under most circumstances, staphylococcus can be found in ~30% of human
population where it remains pathogenic correct answers false
Define commensal bacteria correct answers Commensal bacteria doesn't harm or benefit from the
host which it gets nutrients
When a bacterium neither harms nor benefits from the host from which it obtains nutrients, it is
referred to as being correct answers Commensal
How can staphylococcus be differentially tested? correct answers In the presence of Bile salts
pathogen suppresses host immune system so it can continue replicating correct answers evasion
pathogen passes through or between cells to access deeper tissues and nutrients correct answers
infection
pathogen is passed to another host to restart lifecycle correct answers transmission
Match the following diseases with their respective symptoms:
1. folliculitis
2. scaled- skin syndrome
3.impetigo
4. conjunctivitis
5.opthalma neonatorum
A. Childhood skin disease near mouth/ nose
B. infection of thin, transparent scleral tissue
C. infection occurs at time of birth
D. Pus-filled lesions on skin or hair
E. Ruptured pustules ; treated with penicillin correct answers 1.) D
2.) E
3.) A
4.) B
5.) C
Match the steps of infection to its description:
Pathogen finds a specific target
Pathogen masks its own antigen
Utilization of a portal to gain correct answers 1. attachment
2. evasion
3. entry
True or false. The causative agent of conjunctivitis can be either bacterial or viral correct
answers true
True or false. Staphylococcus is the only causative agent of conjunctivitis. correct answers False
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