Question 1

The neurotoxins of Clostridium botulinum produce (flaccid/tetanic) paralysis by preventing muscle contraction.

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Question 2

Common sources of Listeria are undercooked meats and vegetables and unpasteurized (eggs/milk/juices).

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Question 3

(MRSA/MDR- TB/VRSA) is resistant to numerous antimicrobial agents; therefore, vancomycin is usually used for these infections.

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Question 4

Streptococcus agalactiae is associated with which of the following diseases?

Accepted Answer

Streptococcus agalactiae, also known as Group B Streptococcus, is a common cause of neonatal infections, including bacteremia, pneumonia, and meningitis.

Question 5

The aerobic endospore- former (Clostridium perfringens/Clostridium difficile/Bacillus anthracis) is a strict pathogen of humans and animals.

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Question 6

Bacterial food poisoning resulting from Clostridium (botulinum/difficile/perfringens) contamination is characterized by watery diarrhea accompanied by intestinal cramping but not fever, and it resolves in about a day.

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Question 7

In its role in the development of acne, (Propionibacterium/Staphylococcus/Actinomyces) typically grows in sebaceous glands of the skin.

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Question 8

Streptococcus pneumoniae is a leading cause of

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Streptococcus pneumoniae is a common cause of otitis media, which is an infection of the middle ear.

Question 9

The skin lesions characteristic of cutaneous infections with Bacillus anthracis are

Accepted Answer

Cutaneous anthrax caused by Bacillus anthracis typically presents with eschars, which are black, necrotic lesions.

Question 10

When streptococcal infections involve the skin and surrounding lymph nodes, triggering pain and inflammation, the condition is known as (erysipelas/folliculitis/pyoderma).

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Question 11

The ability to produce (hyaluronidase/lipase/proteases) enables Staphylococcus aureus to penetrate and spread through tissues.

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Question 12

What is the most common disease caused by Propionibacterium?

Accepted Answer

Propionibacterium acnes is a bacterium commonly associated with acne, a skin condition characterized by pimples, blackheads, and cysts.

Question 13

How does the toxin from Clostridium tetani produce its action?

Accepted Answer

The toxin from Clostridium tetani, known as tetanospasmin, blocks the release of inhibitory neurotransmitters like glycine and GABA in the central nervous system, leading to muscle spasms and contractions.

Question 14

The body limits the migration of Streptococcus (agalactiae/pneumoniae/pyogenes) by binding it to the active sites of secretory IgA, which the bacteria overcome by secreting secretory IgA protease.

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Question 15

A "summer cold" that lasts for weeks and is characterized by sore throat, mild fever, dry cough, and malaise may be (pneumococcal/walking) pneumonia.

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Question 16

Infection with Corynebacterium diphtheriae leads to the formation of (pseudomembranes/tubercles) which can severely impair respiratory function.

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Question 17

Successful treatment of diphtheria requires the administration of (antibiotics/antitoxin/immunoglobulin).

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Question 18

The presence of mycolic acid in the cell walls of the opportunistic pathogen (Actinomyces/Nocardia) results in it Gram staining poorly.

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Question 19

In countries where tuberculosis is common, people are vaccinated with (BCG/DOTS/MDR- TB), which contains attenuated Mycobacterium bovis bacteria.

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Question 20

(Enterococcus/Staphylococcus) grow at temperatures up to 45°C, at pH levels as high as 9.6, and in 6.5% NaCl, but they lack structural and chemical elements that make them virulent in the intestinal tract.

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Quiz 19: Pathogenic Gram-Positive Bacteria