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.   stain purple in the Gram stain.
C.   encompass all pathogens.
D.   are more susceptible to antibiotics that target peptidoglycan than gram-positive organisms.
E.   are less susceptible to antibiotics that target peptidoglycan than gram-positive organisms.
F.     
Question #2
All bacterial cells have ________.
A.   one or more fimbriae
B.   capsules
C.   flagella
D.   the ability to produce endospores
E.   one or more chromosomes
Question #3
The outcome of the Gram stain is based on differences in the cell's _____.
A.   membrane
B.     
C.   ribosomes
D.   inclusions
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.   have a predominance of unique, waxy lipids
B.   contain more peptidoglycan
C.   All of the choices are correct.
D.   contain lipopolysaccharide
E.   are easily decolorized
Question #5
Which order below reflects the correct procedure for Gram staining?
A.   Crystal violet–iodine–alcohol/acetone–safranin
B.   Iodine–safranin–crystal violet–alcohol/acetone
C.   Alcohol/acetone–crystal violet–safranin–iodine
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-positive cells contain teichoic acids, whereas gram-negative cells lack teichoic acids in their cell wall.
B.   Gram-negative cells have a thinner layer of peptidoglycan in their cell wall compared to gram-positive cells.
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.   thermophile
B.   psychrophile
C.   osmophile
D.   methanogen
E.   halophile
Question #8
Bacterial cells could have any of the following appendages except _____.
A.   sex pili
B.   flagella
C.   pili
D.   cilia
Question #9
Plasmids ________.
A.   are found in all bacteria
B.   are essential for growth and metabolism
C.   are often the site of pathogenic genes
D.   cannot be passed on to progeny
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.   sarcina
D.   streptococcus
E.   palisade
Question #11
The transfer of genes during bacterial conjugation involves rigid, tubular appendages called _____.
A.   periplasmic flagella (axial filaments)
B.   flagella
C.   sex pili
D.   fimbriae
E.   cilia

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