Bacterial Identification

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  • 1/15 Questions

    Examples of gram positive cocci:

    • Neisseria
    • Shigella
    • Staphylococcus
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About This Quiz

This quiz on 'Bacterial Identification' assesses knowledge of gram-positive cocci, intracellular infections, hemolysis types, and specific pathogens like S. Pyogenes. It's crucial for understanding bacterial characteristics and medical implications, enhancing skills in microbiology and infectious disease diagnosis.

Bacterial Identification - Quiz

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  • 2. 

    What is the effect of betahemolysis?

    • Sickle cell anemia

    • Total destruction of red blood cells

    • Dviding of bacteria

    Correct Answer
    A. Total destruction of red blood cells
    Explanation
    Betahemolysis refers to the complete destruction of red blood cells. In the context of sickle cell anemia, this can occur due to the abnormal sickle-shaped red blood cells being more fragile and prone to rupture. The destruction of red blood cells leads to a decrease in the oxygen-carrying capacity of the blood and can result in various symptoms associated with sickle cell anemia. The option "total destruction of red blood cells" accurately describes the effect of betahemolysis.

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  • 3. 

    What are the two types of Staphylococcus?

    • Staphylooccus epidermidis/ Staphylococcus aureus

    • Neisseria gonorrhoeae/ Neisseria meningiditis

    • Betahemolytic streptococci/ Non betahemolytic strep

    Correct Answer
    A. Staphylooccus epidermidis/ Staphylococcus aureus
    Explanation
    Staphylococcus is a genus of bacteria that includes various species. Among these species, Staphylococcus epidermidis and Staphylococcus aureus are the two types commonly known. Staphylococcus epidermidis is a commensal bacterium found on the skin and mucous membranes, while Staphylococcus aureus is a pathogenic bacterium that can cause various infections in humans. Therefore, the correct answer is Staphylococcus epidermidis/ Staphylococcus aureus.

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  • 4. 

    Streptococcus are:

    • Cocci arranged in clusters

    • Cocci arranged in chains

    • Normal flora in GI tract

    Correct Answer
    A. Cocci arranged in chains
    Explanation
    Streptococcus are cocci arranged in chains. This means that the bacteria are spherical in shape and are arranged in a linear fashion, forming a chain-like structure. This arrangement is a characteristic feature of Streptococcus bacteria, distinguishing them from other types of bacteria.

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  • 5. 

    Which is worse, betahemolysis or alphahemolysis?

    • Betahemolysis

    • Alphahemolysis

    Correct Answer
    A. Betahemolysis
    Explanation
    Betahemolysis is worse than alphahemolysis because it involves the complete lysis of red blood cells, leading to the destruction of the cell membrane and release of intracellular contents. This can cause more severe damage and complications compared to alphahemolysis, which only involves partial lysis of red blood cells.

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  • 6. 

    What is Staphycoccus epidermidis?

    • Causes infections in burn patients

    • Normal flora on the skin entering the blood stream

    • Causes pneumonia

    Correct Answer
    A. Normal flora on the skin entering the blood stream
    Explanation
    Staphylococcus epidermidis is a type of bacteria that is commonly found on the skin as part of the normal flora. However, in certain situations, such as when the skin is compromised or during invasive medical procedures, it can enter the bloodstream and cause infections. This is why it is important to maintain proper hygiene and take precautions to prevent the entry of these bacteria into the bloodstream, especially in burn patients or individuals with weakened immune systems.

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  • 7. 

    What are the two types of Streptococcus?

    • Staphylococcus epidermidis/Staphylococcus aureus

    • Neisseria gonorrhoeae/Neisseria meningiditis

    • Betahemolytic/non-betahemolytic strep

    Correct Answer
    A. Betahemolytic/non-betahemolytic strep
    Explanation
    The two types of Streptococcus are betahemolytic and non-betahemolytic strep. Betahemolytic strep refers to a group of streptococcal bacteria that can cause complete lysis or destruction of red blood cells, leading to a clear zone around the colonies on blood agar plates. Non-betahemolytic strep, on the other hand, does not cause complete lysis of red blood cells and does not produce a clear zone on blood agar plates. These two types of Streptococcus can have different clinical presentations and are important to distinguish for proper diagnosis and treatment.

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  • 8. 

    S. agalactiae effects:

    • Middle-aged

    • Newborns

    • The elderly

    Correct Answer
    A. Newborns
    Explanation
    S. agalactiae primarily affects newborns. This bacterial infection, also known as Group B Streptococcus (GBS), can be transmitted from mother to baby during childbirth. Newborns are particularly vulnerable to this infection due to their immature immune systems. S. agalactiae can cause serious complications in newborns, including pneumonia, sepsis, and meningitis. It is important for pregnant women to be screened for GBS and receive appropriate treatment to prevent transmission to their newborns.

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  • 9. 

    What drug is used to treat MRSA?

    • Vancomysin

    • Pcn

    • Amoxycillin

    Correct Answer
    A. Vancomysin
    Explanation
    Vancomycin is the correct answer because it is a potent antibiotic that is commonly used to treat MRSA (methicillin-resistant Staphylococcus aureus) infections. MRSA is a type of bacteria that is resistant to many antibiotics, including penicillin (pcn) and amoxicillin. Vancomycin is often considered the drug of choice for treating MRSA infections due to its effectiveness against this resistant strain of bacteria.

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  • 10. 

    S. mutans:

    • Cause scarlet fever

    • Cause pneumonia

    • Cause cavities

    Correct Answer
    A. Cause cavities
    Explanation
    S. mutans is a bacterium that is commonly found in the mouth and is known to cause cavities. It feeds on sugars and produces acids that erode tooth enamel, leading to the formation of cavities. Scarlet fever and pneumonia, on the other hand, are caused by different bacteria or viruses and are not directly related to S. mutans. Therefore, the correct answer is that S. mutans causes cavities.

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  • 11. 

    Examples of Betahemolytic?

    • MRSA

    • S. pneumonia

    • S. pyogenes

    Correct Answer
    A. S. pyogenes
    Explanation
    The correct answer is S. pyogenes because it is a beta-hemolytic bacteria. Beta-hemolytic bacteria are able to completely lyse red blood cells, leading to a clear zone around the bacterial colonies on blood agar plates. S. pyogenes is a common cause of various infections such as strep throat, skin infections, and invasive diseases. It is important to correctly identify and treat S. pyogenes infections to prevent complications and spread of the bacteria.

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  • 12. 

    Scarlet fever, pharyngitis, erysipelas, impetigo, rheumatic fever are classified as:

    • S. pyogenes

    • S. agalactiae

    • S. pneumoniae

    Correct Answer
    A. S. pyogenes
    Explanation
    The given answer, S. pyogenes, is correct because scarlet fever, pharyngitis, erysipelas, impetigo, and rheumatic fever are all caused by the bacteria Streptococcus pyogenes. This bacterium is commonly referred to as group A Streptococcus and is responsible for a range of infections, including those mentioned in the question. S. agalactiae, also known as group B Streptococcus, is associated with infections in newborns and pregnant women, while S. pneumoniae causes pneumonia and other respiratory infections.

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  • 13. 

    Gram positive Bacillus:

    • Causes gonorrhoeae

    • Causes botulism

    • Causes anthrax

    Correct Answer
    A. Causes anthrax
    Explanation
    The correct answer is "causes anthrax". Gram-positive Bacillus is a type of bacteria that is known to cause anthrax, a serious infectious disease primarily affecting livestock and wild animals. It can also infect humans through contact with contaminated animals or their products. Anthrax can present in different forms, including cutaneous, inhalation, and gastrointestinal, and can be life-threatening if not treated promptly.

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  • 14. 

    What bacteria infects cells inside the body only:It's similar to a virus

    • Chylamdia

    • Vibrios

    • Mycoplasmas

    Correct Answer
    A. Chylamdia
    Explanation
    Chylamdia is a type of bacteria that can infect cells inside the body. Unlike viruses, which require host cells to replicate, Chylamdia bacteria have the ability to invade and replicate within host cells. This characteristic allows them to cause infections in various parts of the body, such as the eyes, respiratory tract, and reproductive organs. Chylamdia is a common sexually transmitted infection and can also be transmitted from mother to baby during childbirth.

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  • 15. 

    Where are the infection sites of Staphylococcus aureus?

    Correct Answer
    wounds/blood/other sterile body sites
    Explanation
    Staphylococcus aureus can cause infections in various parts of the body. It commonly infects wounds, where it can enter through breaks in the skin. It can also cause bloodstream infections, known as bacteremia, when it enters the bloodstream. Additionally, Staphylococcus aureus can infect other sterile body sites, such as the lungs, heart, or bones, where it can cause serious infections. Therefore, the infection sites of Staphylococcus aureus include wounds, blood, and other sterile body sites.

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  • May 19, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 11, 2010
    Quiz Created by
    Dh0222080
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