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

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

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