Micro: Toxins And Such

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  • 1/17 Questions

    Endotoxins are only released when the cell dies.

    • True
    • False
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Micro: Toxins And Such - Quiz

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  • 2. 

    What structure in the brain to cytokines act on to produce fever?

    • Midbrain

    • Hypothalamus

    • Brainstem

    • Thalamus

    Correct Answer
    A. Hypothalamus
  • 3. 

    The cholera toxin inhibits the regulatory mechanism of?

    • ATP

    • CAMP

    • Protein kinase A

    • GTP

    Correct Answer
    A. CAMP
  • 4. 

    Tetanus affects inhibitory neurons causing continuous stimulation to motor neurons.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The tetanus toxin interferes with synaptic transmission in inhibitory neurons by blocking neurotransmitter release. This allows the excitatory transmitter to continuously stimulate the motor neurons.

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  • 5. 

    Which best represents the composition of LPS?

    • Lipid B, core polysaccharide, variable O-polysaccharide

    • Lipid A, core monosaccharide, variable O-monosaccharide

    • Lipid B, core monosaccharide, variable O-monosaccharide

    • Lipid A, core polysaccharide, variable O-polysaccharide

    Correct Answer
    A. Lipid A, core polysaccharide, variable O-polysaccharide
  • 6. 

    What cytokines are the primary cause of fever? And they're produced by what cell?

    • IL-5, IL-12; eosinophils

    • IL-2, IL-1; T cells

    • IFN-gamma, TNF; macrophages

    • TNF, IL-1; macrophages

    Correct Answer
    A. TNF, IL-1; macrophages
  • 7. 

    What bacteria release LPS?

    • Gram positve

    • Streptococci

    • Gram negative

    • Staphylococci

    Correct Answer
    A. Gram negative
  • 8. 

    After direct activation of completment by LPS, C3a and C5a components are produced in large quantities. This can cause aggregation of PMNs in the pulmonary capillaries resulting in a severe condtion called ____.

    • Acute eosinophilic pneumonia

    • Adult respiratory distress syndrome

    • Acute hypersensitivity pneumonitis

    • Noncardiogenic pulmonary edema

    Correct Answer
    A. Adult respiratory distress syndrome
  • 9. 

    What are the most important effects of LPS?

    • Fever and cell lysis

    • Cell lysis and shock

    • Fever and shock

    Correct Answer
    A. Fever and shock
  • 10. 

    Toxic shock syndrome is caused by ______ infections of the _____.

    • Staphylococcus; intestinal

    • Staphylococcus; genital

    • Streptococcus; intestinal

    • Streptococcus; genital

    Correct Answer
    A. Staphylococcus; genital
  • 11. 

    What codes for proteins of exotoxins?

    • Chromosomes

    • SsDNA

    • MRNA

    • Plasmids

    Correct Answer
    A. Plasmids
  • 12. 

    Botulinum toxin ____ neurotransmitter function of ____ terminals.

    • Inhibits; postsynaptic

    • Inhibits; presynaptic

    • Increases; postsynaptic

    • Increases; presynaptic

    Correct Answer
    A. Inhibits; presynaptic
  • 13. 

    What exotoxin is active at low does and extrememly potent?

    • Tetanus

    • Cholera

    • Diphtheria

    • LPS

    Correct Answer
    A. Tetanus
  • 14. 

    Diphtheria blocks the transfer of _____ _____ to polypeptide chains during ______ of mRNA by ribosomes.

    • Amino acids; transcrption

    • Adenosine diphosphate; translation

    • Amino acids; translation

    • Adenosine diphosphate; transcription

    Correct Answer
    A. Amino acids; translation
  • 15. 

    What toxin(s) are internalized for activation of the A subunit?

    • Tetanus and botulinum

    • Cholera and diphtheria

    • Staphylococcus

    • Diphtheria and botulinum

    Correct Answer
    A. Cholera and diphtheria
  • 16. 

    What bacteria is the most common endotoxic shock with septicemia?

    • E. coli

    • S. aureus

    • Shigella

    • Salmonella

    Correct Answer
    A. E. coli
  • 17. 

    Activation of toxins without altering antigenicity results in successful vaccines.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Inactivation of toxins

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  • Mar 22, 2022
    Quiz Edited by
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  • Nov 03, 2012
    Quiz Created by
    Hollylisa2080
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