Pathogenic Bacteriology Exam 1 Questions and Answers Graded A+
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Course
Pathogenic Bacteriology
Institution
Pathogenic Bacteriology
Pathogenic Bacteriology Exam 1
Questions and Answers Graded A+
What is the primary difference between gram-positive and gram-negative bacteria?
Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have
a thin peptidoglycan layer and an outer membrane.
Which...
Pathogenic Bacteriology Exam 1
Questions and Answers Graded A+
What is the primary difference between gram-positive and gram-negative bacteria?
✔✔Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have
a thin peptidoglycan layer and an outer membrane.
Which bacterium is the leading cause of pneumonia in adults?
✔✔Streptococcus pneumoniae
What structure in bacteria allows for adherence to host cells?
✔✔Fimbriae
What is the role of exotoxins in bacterial pathogenicity?
✔✔Exotoxins are proteins secreted by bacteria that cause damage to host tissues and disrupt
normal cellular function.
What is the primary mechanism of action of penicillin?
✔✔Penicillin inhibits the synthesis of bacterial cell walls by targeting peptidoglycan synthesis.
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,How can Mycobacterium tuberculosis be diagnosed?
✔✔Through a positive sputum culture or PCR test for Mycobacterium tuberculosis DNA.
What type of bacteria is typically responsible for urinary tract infections (UTIs)?
✔✔Escherichia coli
What is the function of bacterial capsules in pathogenicity?
✔✔Capsules protect bacteria from phagocytosis and help in adherence to host tissues.
What is the defining characteristic of spore-forming bacteria?
✔✔They form endospores, which are resistant to environmental stressors like heat, desiccation,
and UV radiation.
What test is used to differentiate Staphylococcus aureus from other staphylococci species?
✔✔The coagulase test, where Staphylococcus aureus coagulates plasma.
What is the significance of the Gram stain in bacteriology?
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, ✔✔The Gram stain helps classify bacteria into two major groups, gram-positive and gram-
negative, based on their cell wall structure.
How does the antibiotic tetracycline work?
✔✔Tetracycline inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit.
What is the typical treatment for infections caused by Mycobacterium tuberculosis?
✔✔A combination of antibiotics, including isoniazid, rifampin, pyrazinamide, and ethambutol.
Which bacteria is responsible for causing botulism?
✔✔Clostridium botulinum
What is the role of bacterial plasmids in antibiotic resistance?
✔✔Plasmids can carry genes that encode for antibiotic resistance, allowing bacteria to survive
exposure to antibiotics.
What is the major virulence factor of Streptococcus pyogenes?
✔✔The M protein, which helps the bacteria evade phagocytosis.
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