Biology and Microbiology Quiz Questions
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Questions and Answers

What is the limitation of determining antibodies against Salmonella typhi antigens in blood serum?

  • It is not specific to the disease
  • It is not of diagnostic value (correct)
  • It is only possible during the convalescence period
  • It requires a long time to produce

Which of the following is NOT a pathogenicity factor of Neisseria gonorrhoeae?

  • Exotoxin
  • Plasmacoagulase
  • Capsule
  • Spores (correct)

What method is used for microbiological diagnosis of leptospirosis?

  • Microscopy of rash elements stained by the Giemza method (correct)
  • Microscopy of smears prepared from sputum and stained by the Sil-Nielsen method
  • Microscopy of Giemza-stained blood smears
  • Microscopy of smears prepared from wound contents

What is the characteristic of antibodies against D-antigen?

<p>They are formed during the convalescence period (C)</p> Signup and view all the answers

What is the characteristic of antibodies against H-antigen?

<p>They are formed during the convalescence period (C)</p> Signup and view all the answers

What type of colonies does a particular bacterium form on a solid nutrient medium?

<p>Creeping colonies covering the entire surface (D)</p> Signup and view all the answers

Which of the following diseases is NOT caused by mycoplasmas?

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

What is the causative agent of ornithosis?

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

Which of the following microorganisms can grow at 42°C?

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

What is the primary method of diagnosis for Escherichia?

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

Which reaction is NOT used in the diagnosis of actinomycosis?

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

What is a pathogenicity factor of Clostridium botulinum?

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

Which reaction is used in the diagnosis of legionellosis?

<p>polymerase chain reaction (A)</p> Signup and view all the answers

What method is used in the diagnosis of tularemia?

<p>microscopic and serological method (A)</p> Signup and view all the answers

What is the characteristic of the bacterium obtained from the cerebrospinal fluid of a newborn child with meningeal symptoms?

<p>Gram-positive, motile, and non-spore-forming (D)</p> Signup and view all the answers

What toxin causes diarrhea by activating adenylate cyclase in the intestinal epithelium?

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

Which diagnostic technique is used for legionellosis?

<p>Polymerase chain reaction (B)</p> Signup and view all the answers

What method is used in the diagnosis of ornithosis?

<p>determination of antibodies in blood serum (B)</p> Signup and view all the answers

What is the characteristic of Yersinia pestis colonies in solid food environments?

<p>Lion's mane-like colonies (B)</p> Signup and view all the answers

What reaction is used in the serological diagnosis of tularemia?

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

Which microorganism is characterized by 8-12 equal folds and is motile?

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

What type of cells are characteristic of bacterial vaginosis?

<p>Epithelial cells with coccobacilli (B)</p> Signup and view all the answers

What is the probable cause of meningeal symptoms in a newborn child?

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

What is the probable cause of a gram-negative, motile, rod-shaped bacterium that forms colorless colonies on Endo medium detected from the blood of a febrile patient?

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

What is the test used to differentiate Streptococcus pneumoniae from other streptococci?

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

Which method is used in the diagnosis of Helicobacter pylori?

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

What is the purpose of the CAMP test?

<p>To diagnose Streptococcus agalactiae (B)</p> Signup and view all the answers

Which of the following bacteria has a C5a-peptidase?

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

What is the result of the effect of pertussis exotoxin on the gut epithelium?

<p>An increase in the amount of cyclic AMP (A)</p> Signup and view all the answers

Flashcards

Salmonella typhi antibody limitations

Blood serum antibody levels against Salmonella typhi antigens are not helpful in diagnosing typhoid fever.

Neisseria gonorrhoeae pathogenicity

Spore formation is not a characteristic of Neisseria gonorrhoeae.

Leptospirosis diagnosis

Leptospirosis is diagnosed by examining rash elements under a microscope using Giemsa stain.

Antibodies against D-antigen

Antibodies against the D-antigen appear in the blood during the recovery phase of an infection, after the acute stage.

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Antibodies against H-antigen

Antibodies against the H-antigen are formed during the convalescence period, after the acute illness.

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Creeping colonies

This type of bacterium produces colonies that spread quickly and cover the entire surface of the culture medium.

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Mycoplasma infections

Infectious mononucleosis is not caused by mycoplasmas. It's caused by the Epstein-Barr virus.

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Ornithosis cause

Ornithosis, also known as psittacosis, is caused by Chlamydia psittaci.

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Campylobacter jejuni growth

Campylobacter jejuni can grow at a slightly higher temperature than most bacteria, at 42°C.

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Escherichia coli diagnosis

The primary method for diagnosing Escherichia coli infections is through bacterial culture and identification.

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Actinomycosis diagnosis

Serological methods are not typically used to diagnose actinomycosis. Other methods like microscopy and culture are preferred.

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Clostridium botulinum pathogenicity

Clostridium botulinum, the bacterium that causes botulism, has a capsule that helps protect it from the host's immune system.

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Legionellosis diagnosis

Polymerase chain reaction (PCR) is a common method used to detect the presence of Legionella bacteria causing Legionnaires' disease.

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Tularemia diagnosis

Tularemia diagnosis involves a combination of microscopic examination of samples and serological tests.

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Newborn meningitis bacteria

The bacterium found in the cerebrospinal fluid of a newborn with meningeal symptoms is typically Gram-positive, motile, and does not form spores.

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Cholera toxin mechanism

The cholerogenic exotoxin produced by Vibrio cholerae causes diarrhea by activating adenylate cyclase in the intestinal cells.

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Legionellosis diagnosis

Legionellosis diagnosis often involves the use of polymerase chain reaction (PCR).

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Ornithosis diagnosis

Ornithosis diagnosis relies on detecting antibodies in the blood serum.

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Yersinia pestis colony morphology

Yersinia pestis, the bacterium causing plague, forms colonies with a distinctive lion's mane-like appearance on solid media.

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Tularemia serological diagnosis

Agglutination reaction is one of the serological tests used to diagnose tularemia.

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Campylobacter characteristics

Campylobacter are characterized by their spiral shape with 8-12 equal folds and their ability to move independently.

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Bacterial vaginosis cells

Bacterial vaginosis is characterized by epithelial cells covered in coccobacilli bacteria.

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Newborn meningeal symptoms

Listeria monocytogenes is a common cause of meningeal symptoms in newborns.

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Fever and bacteremia

Escherichia coli, a gram-negative rod-shaped bacterium, is a likely cause of fever and bacteremia when detected in the blood and forms colorless colonies on Endo agar.

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Streptococcus pneumoniae differentiation

The Optochin test helps differentiate Streptococcus pneumoniae from other streptococcal species.

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Helicobacter pylori diagnosis

Serological methods, which detect antibodies in the blood, are commonly used to diagnose Helicobacter pylori infections.

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CAMP test

The CAMP test is used to help diagnose Streptococcus agalactiae infections, particularly in pregnant women.

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Pseudomonas aeruginosa C5a-peptidase

Pseudomonas aeruginosa has a C5a-peptidase, an enzyme that breaks down complement component C5a.

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Pertussis exotoxin effect

Pertussis toxin, produced by Bordetella pertussis, increases the amount of cyclic AMP (cAMP) in the gut epithelium, contributing to the symptoms of pertussis, such as diarrhea.

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