Microbiology 020 - General Microbiology » Spring 2021 » Chapter 3 Quiz

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Question #1
Gram-negative bacteria
A.   None of the choices is correct.
B.   are more susceptible to antibiotics that target peptidoglycan than gram-positive organisms.
C.   stain purple in the Gram stain.
D.   are less susceptible to antibiotics that target peptidoglycan than gram-positive organisms.
E.   encompass all pathogens.
F.     
Question #2
All bacterial cells have ________.
A.   one or more chromosomes
B.   the ability to produce endospores
C.   flagella
D.   one or more fimbriae
E.   capsules
Question #3
The outcome of the Gram stain is based on differences in the cell's _____.
A.   inclusions
B.     
C.   membrane
D.   ribosomes
E.   flagella
F.   wall
Question #4
The difference in cell wall structure of Mycobacterium and Nocardia compared to the typical gram-positive bacterial cell wall structure is that they ________.
A.   contain more peptidoglycan
B.   have a predominance of unique, waxy lipids
C.   are easily decolorized
D.   contain lipopolysaccharide
E.   All of the choices are correct.
Question #5
Which order below reflects the correct procedure for Gram staining?
A.   Alcohol/acetone–crystal violet–safranin–iodine
B.   Crystal violet–iodine–alcohol/acetone–safranin
C.   Iodine–safranin–crystal violet–alcohol/acetone
D.   Crystal violet–alcohol/acetone–iodine–safranin
Question #6
Which statement below supports the argument that gram-negative cells are structurally weaker than gram-positive cells?
A.   Gram-negative cells have a thinner layer of peptidoglycan in their cell wall compared to gram-positive cells.
B.   Gram-positive cells contain teichoic acids, whereas gram-negative cells lack teichoic acids in their cell wall.
C.   The envelope of gram-negative cells comprises a hydrophobic outer membrane.
D.   Gram-negative cells contain lipopolysaccharides, the lipid component of which acts as an endotoxin.
Question #7
Halobacterium salinarium lives in and requires salt. This is an example of an archaeabacterium described as a(n) _______.
A.   methanogen
B.   psychrophile
C.   halophile
D.   osmophile
E.   thermophile
Question #8
Bacterial cells could have any of the following appendages except _____.
A.   sex pili
B.   pili
C.   cilia
D.   flagella
Question #9
Plasmids ________.
A.   cannot be passed on to progeny
B.   are essential for growth and metabolism
C.   are found in all bacteria
D.   are often the site of pathogenic genes
Question #10
If you looked at a _______ under the microscope, you would likely see an irregular cluster of spherical cells.
A.   staphylococcus
B.   diplococcus
C.   palisade
D.   streptococcus
E.   sarcina
Question #11
The transfer of genes during bacterial conjugation involves rigid, tubular appendages called _____.
A.   cilia
B.   flagella
C.   fimbriae
D.   periplasmic flagella (axial filaments)
E.   sex pili

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