WGU C453 Microbiology OA Practice Questions And
Correct Solutions
Which of the following microorganisms lack mitochondria? Right Ans -
Bacteria
Which bacteria have cell walls that are approximately 10-20% peptidoglycan?
Right Ans - Gram-negative
Which bacteria are difficult to Gram stain? Right Ans - Wall deficient
Which of the following types of bacteria are slow growing, due to the high
lipid content of their cell walls? Right Ans - Acid fast
Which of the following types of bacteria have cell walls that contain sterols?
Right Ans - Wall deficient
Which of the following types of bacteria have both a cell membrane and an
outer membrane? Right Ans - Gram negative
Which of the following is an endotoxin, which can cause fever and
inflammation, and is associated with Gram-negative bacteria? Right Ans -
Lipopolysaccharide
Which of the following structures is associated with Gram-negative bacteria
and is an active area of cell metabolism? Right Ans - Periplasmic space
Which of the following structures is associated with Gram-positive bacteria?
Right Ans - Teichoic acid
What term is used to describe bacterial cells that are spherical in shape?
Right Ans - Coccus
Which of the following is a function of a capsule? Right Ans - Allows
bacteria to adhere to surfaces and each other
Which of the following is a function of peptidoglycan? Right Ans - Protects
cells from bursting
, Which of the following is a function of the cell membrane? Right Ans -
Regulates movement of substances into and out of the bacterial cell
Which of the following statements about pili is false? Right Ans - They
promote chemotaxis.
Which of the following statements about endospores is false? Right Ans -
They are used for reproduction.
Which of the following statements is true about chemotaxis? Right Ans -
Flagella facilitate chemotaxis.
___________ are intracellular pathogens that require a host cell to replicate.
Right Ans - Viruses
Which of the following statements is true about reverse transcriptase?
Right Ans - It is associated with the Retroviridae family.
What is the difference between a naked virus and an enveloped virus?
Right Ans - An enveloped virus contains an external membrane, but the naked
virus does not.
Which of the following is not a viral group? Right Ans - Positive sense DNA
virus
Which viral family is composed of (-) sense single-stranded RNA with an
envelope and causes the flu? Right Ans - Orthomyxoviridae
Which type of infectious agent can be multicellular or single-celled and can
reproduce both sexually and asexually? Right Ans - Fungi
Histoplasma are dimorphic fungi. What of the following statements is true
about Histoplasma? Right Ans - They can grow in a yeast-like form or as a
filamentous mycelium.
Which of the following statements is false about hypha? Right Ans - A yeast
cell is called a hypha.
Correct Solutions
Which of the following microorganisms lack mitochondria? Right Ans -
Bacteria
Which bacteria have cell walls that are approximately 10-20% peptidoglycan?
Right Ans - Gram-negative
Which bacteria are difficult to Gram stain? Right Ans - Wall deficient
Which of the following types of bacteria are slow growing, due to the high
lipid content of their cell walls? Right Ans - Acid fast
Which of the following types of bacteria have cell walls that contain sterols?
Right Ans - Wall deficient
Which of the following types of bacteria have both a cell membrane and an
outer membrane? Right Ans - Gram negative
Which of the following is an endotoxin, which can cause fever and
inflammation, and is associated with Gram-negative bacteria? Right Ans -
Lipopolysaccharide
Which of the following structures is associated with Gram-negative bacteria
and is an active area of cell metabolism? Right Ans - Periplasmic space
Which of the following structures is associated with Gram-positive bacteria?
Right Ans - Teichoic acid
What term is used to describe bacterial cells that are spherical in shape?
Right Ans - Coccus
Which of the following is a function of a capsule? Right Ans - Allows
bacteria to adhere to surfaces and each other
Which of the following is a function of peptidoglycan? Right Ans - Protects
cells from bursting
, Which of the following is a function of the cell membrane? Right Ans -
Regulates movement of substances into and out of the bacterial cell
Which of the following statements about pili is false? Right Ans - They
promote chemotaxis.
Which of the following statements about endospores is false? Right Ans -
They are used for reproduction.
Which of the following statements is true about chemotaxis? Right Ans -
Flagella facilitate chemotaxis.
___________ are intracellular pathogens that require a host cell to replicate.
Right Ans - Viruses
Which of the following statements is true about reverse transcriptase?
Right Ans - It is associated with the Retroviridae family.
What is the difference between a naked virus and an enveloped virus?
Right Ans - An enveloped virus contains an external membrane, but the naked
virus does not.
Which of the following is not a viral group? Right Ans - Positive sense DNA
virus
Which viral family is composed of (-) sense single-stranded RNA with an
envelope and causes the flu? Right Ans - Orthomyxoviridae
Which type of infectious agent can be multicellular or single-celled and can
reproduce both sexually and asexually? Right Ans - Fungi
Histoplasma are dimorphic fungi. What of the following statements is true
about Histoplasma? Right Ans - They can grow in a yeast-like form or as a
filamentous mycelium.
Which of the following statements is false about hypha? Right Ans - A yeast
cell is called a hypha.
