L1 intro to Microbiology
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Questions and Answers

What happens when microorganisms are introduced directly into the bloodstream or internal organs?

  • The microorganisms multiply and cause the host to react, leading to infection. (correct)
  • The host's body functions are impaired, leading to infectious disease.
  • The host's immune system immediately eliminates the microorganisms.
  • The microorganisms enter a carrier state, but do not cause harm to the host.

What is the characteristic of the chromosome in prokaryotic cells?

  • Single, circular chromosome with nucleoli (correct)
  • Single, linear chromosome with no nucleoli
  • Multiple, linear chromosomes with nucleoli
  • Multiple, circular chromosomes with no nucleoli

What is a characteristic that distinguishes eukaryotic pathogens from others?

  • Ability to undergo photosynthesis
  • Ability to form endospores
  • Absence of a cell wall
  • Presence of a well-defined nucleus (correct)

What is the function of the cell wall in bacteria?

<p>To maintain a fixed cell shape (B)</p> Signup and view all the answers

What is the main difference between prokaryotic and eukaryotic cells?

<p>Presence or absence of a nucleus (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic of bacteria?

<p>Presence of a well-defined nucleus (C)</p> Signup and view all the answers

What is a characteristic of mycoplasma?

<p>Lack of a cell wall (D)</p> Signup and view all the answers

What is the common characteristic of prokaryotic pathogens?

<p>They are mainly divided into bacteria and archaea (B)</p> Signup and view all the answers

Which of the following is an example of an atypical bacterium?

<p>Chlamydia (B)</p> Signup and view all the answers

What is the name of the basic shape that bacteria can assume?

<p>Coccus, bacillus, or vibrio (D)</p> Signup and view all the answers

What is the characteristic of helminths?

<p>Multicellular, eukaryotic, and parasitic (D)</p> Signup and view all the answers

What is the characteristic of the ribosome in prokaryotic cells?

<p>70S (A)</p> Signup and view all the answers

What is the size range of prokaryotic cells?

<p>0.2-2 mm in diameter (B)</p> Signup and view all the answers

What is the composition of viruses?

<p>Genetic material surrounded by a protein coat (B)</p> Signup and view all the answers

What is the characteristic of prions?

<p>Altered protein conformation and point mutations (D)</p> Signup and view all the answers

Which of the following is NOT a characteristic of protozoa?

<p>Photosynthetic (C)</p> Signup and view all the answers

What is the primary mechanism by which normal flora prevent the colonization of the body by pathogens?

<p>Production of antimicrobial substances (B)</p> Signup and view all the answers

What is the function of the capsule in bacterial cells?

<p>To mediate adherence to surfaces (B)</p> Signup and view all the answers

What is the composition of the cell cytoplasmic membrane in bacteria?

<p>Phospholipid bilayer (A)</p> Signup and view all the answers

What is the function of Vit.K and Vitamin B produced by normal flora?

<p>To aid in digestion and nutrient absorption (C)</p> Signup and view all the answers

What is the effect of C.di on the gut?

<p>Irritation (A)</p> Signup and view all the answers

What is the significance of bacterial colonization in new-born infants?

<p>Stimulates immune response (A)</p> Signup and view all the answers

What is the characteristic feature of all bacteria?

<p>Prokaryotic cell structure (A)</p> Signup and view all the answers

What is the difference between Gram-positive and Gram-negative bacteria?

<p>Thickness of the peptidoglycan layer (A)</p> Signup and view all the answers

What is the primary function of the self-produced matrix of extracellular polymeric substances in biofilm formation?

<p>To protect the bacteria from the host's immune response and antimicrobial drugs (A)</p> Signup and view all the answers

Which of the following is an example of host-mediated pathogenesis?

<p>Inflammation caused by the host's immune response (B)</p> Signup and view all the answers

What is the primary purpose of antigenic variation in bacteria?

<p>To evade the host's immune system (D)</p> Signup and view all the answers

Which structure is used by Escherichia coli to adhere to host cells?

<p>Pili (C)</p> Signup and view all the answers

What is the primary function of bacterial enzymes such as collagenase and hyaluronidase?

<p>To degrade the host's extracellular matrix (C)</p> Signup and view all the answers

What is the term for the ability of bacteria to enter or penetrate host cells or mucosa?

<p>Invasiveness (D)</p> Signup and view all the answers

What is the name of the membrane protein that interacts with host cells to facilitate bacterial uptake?

<p>Invasion (C)</p> Signup and view all the answers

Which of the following is NOT a mechanism used by bacteria to evade the host's immune system?

<p>Production of toxins that harm the host (C)</p> Signup and view all the answers

What is the primary characteristic of exotoxins produced by bacteria?

<p>They are secreted out of the pathogenic cell and are highly toxic (A)</p> Signup and view all the answers

Which type of toxin is a lipid portion of lipopolysaccharide (LPS) that is part of the outer membrane of Gram-negative bacteria?

<p>Endotoxin (C)</p> Signup and view all the answers

What is the primary difference between aerobic and anaerobic respiration in bacteria?

<p>The type of electron acceptor used (A)</p> Signup and view all the answers

What is the purpose of Gram staining in the identification of bacteria?

<p>To distinguish between Gram-positive and Gram-negative bacteria (C)</p> Signup and view all the answers

Which of the following is a characteristic of Gram-positive bacteria?

<p>A thick layer of peptidoglycan in the cell wall (A)</p> Signup and view all the answers

What is the primary advantage of aerobic respiration over fermentation in bacteria?

<p>It produces more ATP (B)</p> Signup and view all the answers

Which of the following is a characteristic of endotoxins?

<p>They are moderately toxic and heat stable (D)</p> Signup and view all the answers

What is the primary difference between obligate and facultative anaerobes?

<p>Their ability to use oxygen as a terminal electron acceptor (D)</p> Signup and view all the answers

What is the primary function of the electron transport chain in bacterial energy production?

<p>To produce ATP (A)</p> Signup and view all the answers

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