WGU C453 Clinical Microbiology Verified Answers
What type of microorganism is responsible for nitrogen fixation in soil?
✔️✔️ Certain bacteria, like *Rhizobium*, are responsible for nitrogen fixation in soil.
What is the primary role of mitochondria in eukaryotic cells?
✔️✔️ Mitochondria produce energy in the form of ATP through cellular respiration.
Define the term “pathogenicity.”
✔️✔️ Pathogenicity is the ability of an organism to cause disease.
How does the innate immune system recognize pathogens?
✔️✔️ The innate immune system recognizes pathogens through pattern recognition receptors (PRRs)
that detect common microbial molecules.
What is the purpose of Koch’s postulates?
✔️✔️ Koch’s postulates are a set of criteria to establish a causative relationship between a
microorganism and a disease.
How do antibiotics affect bacterial ribosomes?
✔️✔️ Some antibiotics bind to bacterial ribosomes, inhibiting protein synthesis and stopping cell
growth.
What are biofilms, and why are they significant in healthcare?
✔️✔️ Biofilms are communities of microorganisms that adhere to surfaces and resist antibiotics,
complicating treatment.
What is binary fission?
, ✔️✔️ Binary fission is the process by which bacteria reproduce by splitting into two identical cells.
Why is genetic recombination important for bacteria?
✔️✔️ Genetic recombination introduces genetic diversity, allowing bacteria to adapt to new
environments or antibiotics.
What type of nucleic acid do retroviruses carry?
✔️✔️ Retroviruses carry RNA as their genetic material.
How do macrophages contribute to the immune response?
✔️✔️ Macrophages engulf and destroy pathogens, present antigens, and release signaling molecules
to activate other immune cells.
Explain what a “latent virus” is.
✔️✔️ A latent virus is one that remains dormant in the host cells and can reactivate under certain
conditions.
What is a “selective medium” in microbiology?
✔️✔️ A selective medium supports the growth of certain microbes while inhibiting others, helping in
isolation.
What is the importance of the peptidoglycan layer in bacteria?
✔️✔️ Peptidoglycan provides structural support and protection, especially in Gram-positive bacteria.
What does “endotoxin” refer to, and where is it found?
✔️✔️ Endotoxin is a toxin found in the outer membrane of Gram-negative bacteria that can cause
inflammatory responses.
What role do memory B-cells play in immunity?
What type of microorganism is responsible for nitrogen fixation in soil?
✔️✔️ Certain bacteria, like *Rhizobium*, are responsible for nitrogen fixation in soil.
What is the primary role of mitochondria in eukaryotic cells?
✔️✔️ Mitochondria produce energy in the form of ATP through cellular respiration.
Define the term “pathogenicity.”
✔️✔️ Pathogenicity is the ability of an organism to cause disease.
How does the innate immune system recognize pathogens?
✔️✔️ The innate immune system recognizes pathogens through pattern recognition receptors (PRRs)
that detect common microbial molecules.
What is the purpose of Koch’s postulates?
✔️✔️ Koch’s postulates are a set of criteria to establish a causative relationship between a
microorganism and a disease.
How do antibiotics affect bacterial ribosomes?
✔️✔️ Some antibiotics bind to bacterial ribosomes, inhibiting protein synthesis and stopping cell
growth.
What are biofilms, and why are they significant in healthcare?
✔️✔️ Biofilms are communities of microorganisms that adhere to surfaces and resist antibiotics,
complicating treatment.
What is binary fission?
, ✔️✔️ Binary fission is the process by which bacteria reproduce by splitting into two identical cells.
Why is genetic recombination important for bacteria?
✔️✔️ Genetic recombination introduces genetic diversity, allowing bacteria to adapt to new
environments or antibiotics.
What type of nucleic acid do retroviruses carry?
✔️✔️ Retroviruses carry RNA as their genetic material.
How do macrophages contribute to the immune response?
✔️✔️ Macrophages engulf and destroy pathogens, present antigens, and release signaling molecules
to activate other immune cells.
Explain what a “latent virus” is.
✔️✔️ A latent virus is one that remains dormant in the host cells and can reactivate under certain
conditions.
What is a “selective medium” in microbiology?
✔️✔️ A selective medium supports the growth of certain microbes while inhibiting others, helping in
isolation.
What is the importance of the peptidoglycan layer in bacteria?
✔️✔️ Peptidoglycan provides structural support and protection, especially in Gram-positive bacteria.
What does “endotoxin” refer to, and where is it found?
✔️✔️ Endotoxin is a toxin found in the outer membrane of Gram-negative bacteria that can cause
inflammatory responses.
What role do memory B-cells play in immunity?
