Bacteriology Anaerobes Quiz
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Questions and Answers
- 1.
Moderate anaerobes are unable to multiply in an atmosphere containing more than ____
- A.
10-20% oxygen
- B.
5-10% oxygen
- C.
2-8% oxygen
- D.
7-14% oxygen
Correct Answer
C. 2-8% oxygenExplanation
Moderate anaerobes are microorganisms that can tolerate low levels of oxygen but cannot survive in high oxygen environments. The correct answer, 2-8% oxygen, indicates that moderate anaerobes are unable to multiply in an atmosphere containing more than 2-8% oxygen. This range of oxygen concentration is considered too high for their survival and growth.Rate this question:
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- 2.
Strict anaerobes cannot multiply in the presence of more than _______ oxygen.
- A.
2%
- B.
1%
- C.
.5%
- D.
10%
Correct Answer
C. .5%Explanation
Strict anaerobes are microorganisms that cannot survive or multiply in the presence of oxygen. They lack the necessary enzymes to detoxify reactive oxygen species, which are harmful byproducts of oxygen metabolism. Therefore, even a small amount of oxygen can be toxic to strict anaerobes. The correct answer, .5%, indicates that strict anaerobes cannot multiply in an environment where the oxygen concentration exceeds .5%.Rate this question:
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- 3.
_____ anaerobes are seldom associated with human infections
- A.
Moderate
- B.
Strict
Correct Answer
B. StrictExplanation
Strict anaerobes are seldom associated with human infections because they cannot survive or grow in the presence of oxygen. These organisms require an oxygen-free environment to thrive and reproduce. Therefore, they are less likely to cause infections in humans compared to moderate anaerobes, which can tolerate some level of oxygen. Infections caused by strict anaerobes are usually limited to deep tissue or closed spaces where oxygen is limited or absent, such as abscesses or deep wounds.Rate this question:
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- 4.
________ anaerobes are those that exist outside the bodies of animals
- A.
Endogenous
- B.
Exogenous
Correct Answer
B. ExogenousExplanation
Exogenous anaerobes are those that exist outside the bodies of animals. This means that they can be found in the external environment, such as soil or water, rather than inside the bodies of animals. Endogenous anaerobes, on the other hand, are those that exist within the bodies of animals. Therefore, the correct answer is Exogenous.Rate this question:
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- 5.
_______ anaerobes are those that exist inside the bodies of animals also called
- A.
Endogenous
- B.
Exogenous
Correct Answer
A. EndogenousExplanation
Endogenous anaerobes are those that exist inside the bodies of animals. These anaerobes are typically found in the gastrointestinal tract, oral cavity, and reproductive organs of animals. They play important roles in various physiological processes, such as digestion and immune system regulation. Endogenous anaerobes are different from exogenous anaerobes, which are typically found in the external environment and can cause infections when they enter the body.Rate this question:
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- 6.
Anaerobes causing human infection are most frequently ______ in origin.
- A.
Exogenous
- B.
Endogenous
Correct Answer
B. EndogenousExplanation
Anaerobes causing human infection are most frequently endogenous in origin. This means that they originate from the patient's own body, such as the normal flora present in the gastrointestinal tract, respiratory tract, or genitourinary tract. Endogenous infections occur when these normal flora organisms invade normally sterile sites in the body due to factors like immunosuppression, trauma, or surgery. On the other hand, exogenous infections occur when the pathogen is acquired from an external source, such as the environment or another infected individual. However, in the case of anaerobes causing human infection, endogenous origin is more common.Rate this question:
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- 7.
_____% of bacteria in saliva, nasal washings and gingival and tooth scrapings are anaerobic
- A.
50
- B.
20
- C.
70
- D.
90
- E.
40
Correct Answer
D. 90Explanation
The given answer states that 90% of bacteria in saliva, nasal washings, and gingival and tooth scrapings are anaerobic. This means that the majority of bacteria found in these samples do not require oxygen to survive and can thrive in environments with low or no oxygen levels. This information suggests that anaerobic bacteria play a significant role in these areas of the body and highlights the importance of understanding their characteristics and behavior for dental and oral health.Rate this question:
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- 8.
Most anaerobes are ____- smelling
- A.
Sweet
- B.
Foul
Correct Answer
B. FoulExplanation
Most anaerobes are foul-smelling because they produce volatile sulfur compounds as byproducts of their metabolism. These compounds, such as hydrogen sulfide, have a strong, unpleasant odor resembling rotten eggs. This characteristic odor is commonly associated with anaerobic bacterial infections, such as those found in certain types of wounds or in the gastrointestinal tract.Rate this question:
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- 9.
Expectorated sputum is cultured for the presence of anaerobes.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
They contain indigenous anaerobes from the oral cavity making it difficult to show that they cause patient disease.Rate this question:
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- 10.
Transtracheal aspirates are collected to diagnose aspiration pneumonia.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Collection does not involve the sputum specimen passing through the oral cavity so less contamination.Rate this question:
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- 11.
About half the bacteria in cervical and vaginal cultures are anaerobes; cannot be distinguished as indigenous or actually causing infection.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because it states that about half of the bacteria found in cervical and vaginal cultures are anaerobes. Anaerobes are bacteria that can survive and grow without oxygen. Additionally, the statement mentions that these bacteria cannot be distinguished as indigenous or actually causing infection. This means that even though these bacteria are present, it is difficult to determine if they are harmless or actually causing an infection. Therefore, the statement is true.Rate this question:
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- 12.
Anaerobes outnumber aerobes by _____:__.
- A.
500:1
- B.
1000:1
- C.
1000,000:1
- D.
10:1
- E.
100:1
Correct Answer
B. 1000:1Explanation
Anaerobes outnumber aerobes by 1000:1. This means that for every 1 aerobe, there are 1000 anaerobes. This suggests that anaerobes, which are organisms that can survive without oxygen, are much more abundant than aerobes, which require oxygen to survive.Rate this question:
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- 13.
The only anaerobe of interest in the Gastrointestinal tract is _____.
- A.
Clostridium difficile
- B.
Propionibacterium acnes
- C.
Bacteroides fragilis
Correct Answer
A. Clostridium difficileExplanation
It causes pseudomembranous colitis and/or antibiotic associated diarrhea.Rate this question:
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- 14.
Testing for the presence of Clostridium difficle is done by looking for _________________.
- A.
Presence of toxins
- B.
Growth of the organism
Correct Answer
A. Presence of toxinsExplanation
Testing for the presence of Clostridium difficile is done by looking for the presence of toxins. This is because Clostridium difficile is a bacterium that produces toxins, specifically toxins A and B, which are responsible for causing symptoms such as diarrhea and inflammation of the colon. Therefore, detecting the presence of these toxins in a patient's stool sample confirms the presence of Clostridium difficile infection.Rate this question:
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- 15.
The absence of leukocytes in Human infections rules out anaerobic infection.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Anaerobes can produce virulence factors that contribute to the necrotizing process by destroying neutrophils, macrophages and other cells.Rate this question:
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- 16.
Gram positive Sporeforming Anaerobic Bacilli are all classified as _____.
- A.
Bacteroides
- B.
Porphyromonoas
- C.
Clostridium
Correct Answer
C. ClostridiumExplanation
Gram positive Sporeforming Anaerobic Bacilli are all classified as Clostridium because Clostridium is a genus of bacteria that includes several species of Gram-positive, spore-forming, and anaerobic bacilli. These bacteria are commonly found in soil, water, and the gastrointestinal tract of animals and humans. They are known for their ability to form endospores, which are highly resistant structures that allow the bacteria to survive in harsh environmental conditions. Clostridium species can cause a variety of diseases, including botulism, tetanus, and gas gangrene.Rate this question:
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- 17.
Spores of Clostridia may be grouped by the location of the spore. Spores are described as
- A.
Terminal
- B.
Middle
- C.
Posterior
- D.
Anterior
- E.
Subterminal
- F.
Middle
- G.
Central
Correct Answer(s)
A. Terminal
E. Subterminal
G. CentralExplanation
The spores of Clostridia can be classified based on their location within the bacterial cell. Terminal spores are located at the end of the cell, subterminal spores are positioned slightly away from the end but not in the middle, and central spores are found in the middle of the cell.Rate this question:
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- 18.
Clostridiums species are most frequently isolated from _____ anaerobic infections.
- A.
Endogenous
- B.
Exogenous
Correct Answer
B. ExogenousExplanation
Exogenous anaerobic infections are caused by microorganisms that come from outside the body, such as through contact with contaminated surfaces or objects. Clostridium species, which are commonly found in soil and the gastrointestinal tract of animals and humans, can cause exogenous anaerobic infections when they enter the body through wounds, surgical incisions, or other means of direct contamination. This is why the correct answer is "exogenous" for the question.Rate this question:
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- 19.
Clostridium. difficile is the only Clostridia infection of ______ origin.
- A.
Exogenous
- B.
Endogenous
Correct Answer
B. EndogenousExplanation
Clostridium difficile is the only Clostridia infection of endogenous origin. This means that the infection arises from within the body itself, rather than being caused by external factors or sources. Clostridium difficile is a bacterium that is normally present in the gut, but when the balance of bacteria in the gut is disrupted, it can overgrow and cause infection. This disruption can occur due to factors such as antibiotic use, which can kill off the beneficial bacteria in the gut and allow Clostridium difficile to thrive. Therefore, the infection is endogenous, originating from within the body.Rate this question:
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- 20.
Clostridia cause disease such as
- A.
Tetanus
- B.
Gas gangrene
- C.
Food poisoning
- D.
Botulism
- E.
All of the Above
- F.
None of the Above
Correct Answer
E. All of the AboveExplanation
Clostridia are a group of bacteria that can cause various diseases. Tetanus is caused by the Clostridium tetani bacteria, which affects the nervous system. Gas gangrene is caused by Clostridium perfringens bacteria, leading to tissue death. Food poisoning can be caused by different species of Clostridia, including Clostridium botulinum, which also causes botulism, a severe illness affecting the nervous system. Therefore, all the mentioned diseases - tetanus, gas gangrene, food poisoning, and botulism - can be caused by different species of Clostridia.Rate this question:
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- 21.
Clostridium perfringens is associated with two types of food poisoning. Type A is ____.
- A.
A mild and self-limited illness of the GI tract
- B.
serous but rarely seen in GI illness
Correct Answer
A. A mild and self-limited illness of the GI tractExplanation
Clostridium perfringens is a bacterium associated with two types of food poisoning. Type A is characterized as a mild and self-limited illness of the gastrointestinal (GI) tract. This means that the symptoms caused by Type A Clostridium perfringens food poisoning are generally not severe and resolve on their own without requiring extensive medical intervention. The illness primarily affects the GI tract, causing symptoms such as abdominal pain, diarrhea, and nausea. It is important to note that Type A Clostridium perfringens food poisoning is different from Type B, which is characterized by a more severe and potentially life-threatening illness.Rate this question:
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- 22.
Clostridium perfringens is associated with two types of food poisoning. Type C is ____.
- A.
A mild and self-limited illness of the GI tract
- B.
More serious but rarely seen GI illness
Correct Answer
B. More serious but rarely seen GI illnessExplanation
Clostridium perfringens is a bacterium that is commonly associated with food poisoning. It is known to cause two types of food poisoning, Type A and Type C. Type C is characterized as a more serious but rarely seen gastrointestinal illness. This means that although it is a severe form of food poisoning caused by Clostridium perfringens, it is not frequently encountered in comparison to Type A food poisoning. Therefore, Type C food poisoning is considered to be a less common but more severe form of gastrointestinal illness caused by this bacterium.Rate this question:
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- 23.
Type A entertoxin from Clostridium perfringens requires what kind of treatment?
- A.
Fluid replacement
- B.
Antibiotics
Correct Answer
A. Fluid replacementExplanation
Clostridium perfringens is a bacterium that produces Type A entertoxin, which causes food poisoning. The toxin primarily affects the gastrointestinal system, leading to symptoms like diarrhea and abdominal pain. The treatment for this type of food poisoning involves fluid replacement. This is because the toxin causes dehydration through diarrhea, and replenishing lost fluids is essential to prevent complications. Antibiotics may not be necessary in most cases, as the illness is usually self-limiting and resolves on its own with supportive care. However, in severe cases or when complications arise, antibiotics may be prescribed to combat the infection.Rate this question:
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- 24.
Type C entertoxin from Clostridium perfringens requires what kind of treatment?
- A.
Fluid replacement
- B.
Treatment with antibiotics
Correct Answer
B. Treatment with antibioticsExplanation
Type C entertoxin from Clostridium perfringens requires treatment with antibiotics because antibiotics are effective in killing the bacteria and stopping the production of the toxin. Antibiotics help to eliminate the infection and prevent further complications. Fluid replacement may be necessary to manage dehydration caused by the illness, but it does not directly target the toxin or the bacteria. Therefore, treatment with antibiotics is the most appropriate approach to combat Type C entertoxin from Clostridium perfringens.Rate this question:
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- 25.
Clostridium boutulinus produces seven different botulinium toxins(A-G). Which types are associated with human infections?
- A.
A, B, and C
- B.
A, B, G
- C.
C, B, E
- D.
A, B, E
- E.
A, E, G
Correct Answer
D. A, B, EExplanation
Clostridium botulinum produces seven different botulinum toxins (A-G). Among these toxins, types A, B, and E are associated with human infections.Rate this question:
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- 26.
Infant botulism follows ingestion of __________.
- A.
Spores, not toxin
- B.
Toxin not spores
- C.
None of the above
Correct Answer
A. Spores, not toxinExplanation
Infant botulism is caused by the ingestion of spores, not the toxin itself. These spores are typically found in contaminated soil or honey and can germinate in the infant's intestines, producing the toxin. The toxin then affects the nervous system, leading to symptoms such as muscle weakness and difficulty feeding. It is important to note that while the spores are harmless to older children and adults, infants under one year old are susceptible to this type of botulism due to their immature digestive systems.Rate this question:
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- 27.
Most common food source that is contaminated in Botulism is ________.
- A.
Yogurt
- B.
Meat
- C.
Honey
- D.
Milk
Correct Answer
C. HoneyExplanation
Honey is the correct answer because it is a common food source that can be contaminated with the bacteria that causes botulism. Botulism is a rare but serious illness caused by the toxin produced by the bacteria Clostridium botulinum. This bacteria can be found in soil and can contaminate honey, especially when it is raw or unpasteurized. Infants under one year old are particularly at risk for botulism from honey, as their immune systems are not fully developed to fight off the bacteria. Therefore, it is recommended to avoid feeding honey to infants to prevent botulism.Rate this question:
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- 28.
Clostridium _____ produces a neurotoxin which prevents the release of neurotransmitters. Results in continous muscular spasm leading to "lockjaw", distorted grin and difficulty breathing
- A.
Botulinum
- B.
Perfringens
- C.
Tetani
Correct Answer
C. TetaniExplanation
Clostridium Tetani produces a neurotoxin that inhibits the release of neurotransmitters. This toxin causes continuous muscular spasms, resulting in "lockjaw," a distorted grin, and difficulty breathing.Rate this question:
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- 29.
C. perfringens is the most common cause of
- A.
Tetanus
- B.
Botulism
- C.
Gas Gangrene
Correct Answer
C. Gas GangreneExplanation
C. perfringens is the most common cause of Gas Gangrene. Gas Gangrene is a serious and potentially life-threatening infection that occurs when certain bacteria, such as C. perfringens, infect deep wounds or injured tissue. These bacteria thrive in anaerobic (oxygen-deprived) environments, and they produce toxins that destroy healthy tissue and create gas bubbles. Gas Gangrene is characterized by severe pain, swelling, and a foul-smelling discharge from the infected area. Prompt medical intervention is necessary to prevent the infection from spreading and causing further damage.Rate this question:
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- 30.
The most common cause of antibiotic-associated diarrhea and pseudomembranous Colitis is
- A.
Clostridium difficile
- B.
Clostridium perfringens
- C.
Clostridium histolyticum
Correct Answer
A. Clostridium difficileExplanation
Clostridium difficile is the correct answer because it is the most common cause of antibiotic-associated diarrhea and pseudomembranous colitis. This bacterium produces toxins that damage the lining of the colon, leading to inflammation and diarrhea. Antibiotics disrupt the normal balance of bacteria in the gut, allowing Clostridium difficile to overgrow and cause infection. The symptoms of Clostridium difficile infection can range from mild diarrhea to severe colitis, and it can be life-threatening in some cases. Prompt diagnosis and treatment are important to prevent complications and spread of the infection.Rate this question:
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- 31.
Clostridium difficlei has two toxins. Toxin A is an ________.
- A.
Cytotoxin
- B.
Enterotoxin
Correct Answer
B. EnterotoxinExplanation
Clostridium difficile is a bacterium that produces two toxins, Toxin A and Toxin B. Toxin A is known as an enterotoxin, which means it targets and damages the cells lining the intestines. This toxin disrupts the normal functioning of the intestinal lining, leading to symptoms like diarrhea, inflammation, and abdominal pain. Enterotoxins are typically responsible for causing intestinal diseases by affecting the absorption and secretion processes in the intestines. Therefore, in the case of Clostridium difficile, Toxin A acts as an enterotoxin, causing gastrointestinal symptoms and contributing to the pathogenicity of the bacterium.Rate this question:
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- 32.
Clostridium difficlei has two toxins. Toxin B is an ________.
- A.
Cytotoxin
- B.
Enterotoxin
Correct Answer
A. CytotoxinExplanation
Clostridium difficile is a bacterium that produces two toxins, one of which is Toxin B. Toxin B is classified as a cytotoxin, meaning it is toxic to cells. This toxin specifically targets and damages the cells lining the colon, leading to inflammation and damage to the intestinal lining. This can result in symptoms such as diarrhea, abdominal pain, and fever, which are characteristic of Clostridium difficile infection. Therefore, the correct answer is cytotoxin.Rate this question:
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- 33.
Actinomyces cause actinomycosis. Actinomycosis is a chronic, granulomatous infection that causes development of sinus tracts, fistulae, which come to the surface and drain pus containing "___ granules"
- A.
Zinc
- B.
Iron
- C.
Diamond
- D.
Sulfur
- E.
Sugar
Correct Answer
D. SulfurExplanation
Actinomyces is a type of bacteria that causes actinomycosis, a chronic infection characterized by the development of sinus tracts and fistulae. These sinus tracts come to the surface and drain pus containing "sulfur granules." These granules are composed of sulfur and are a characteristic feature of actinomycosis.Rate this question:
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- 34.
Gram stain for Actinomyces show thin Gram ______ branching rods.
- A.
Positive
- B.
Negative
- C.
Neutral
- D.
None of the Above
Correct Answer
A. PositiveExplanation
Actinomyces is a genus of bacteria that are gram-positive, meaning they retain the crystal violet stain during the Gram staining process. The statement in the question indicates that the Gram stain for Actinomyces shows thin Gram-positive branching rods.Rate this question:
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- 35.
Bacterial vaginosis involves the overgrowth of Mobiluncus species, an _________ anaerobe
- A.
Exogenous
- B.
Endogenous
Correct Answer
B. EndogenousExplanation
Bacterial vaginosis is a condition characterized by the overgrowth of Mobiluncus species, which are endogenous anaerobes. This means that they are naturally present in the body and can cause an infection when their population increases. Exogenous anaerobes, on the other hand, come from external sources and are not typically associated with bacterial vaginosis. Therefore, the correct answer is endogenous.Rate this question:
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- 36.
Mobiluncus species are ______ Gram positive rods.
- A.
Squared
- B.
Straight
- C.
Curved
Correct Answer
C. CurvedExplanation
Mobiluncus species are curved Gram positive rods. Gram positive rods refer to a specific shape and staining characteristic of bacteria. In this case, Mobiluncus species are described as curved, indicating that their shape is not straight or squared. This information helps to classify and identify the bacteria based on their morphology.Rate this question:
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- 37.
Only a few genera of anaerobic Gram negative rods are seen in clinical specimens. Which of these is not one of the major four.
- A.
Bacteroides fragilis
- B.
Clostridium Histolytica
- C.
Porphyromonas
- D.
Prevotella
- E.
Fusobacterium
Correct Answer
B. Clostridium HistolyticaExplanation
Clostridium Histolytica is not one of the major four genera of anaerobic Gram negative rods seen in clinical specimens. The major four genera are Bacteroides fragilis, Porphyromonas, Prevotella, and Fusobacterium. Clostridium Histolytica is a misnomer as there is no species with this name. The correct name is Clostridium perfringens, which is a Gram positive rod and not a Gram negative rod.Rate this question:
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