A Biology Quiz About Mycoplasma!

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  • 1/28 Questions

    Mycoplasmas are pleomorphic organisms that have a cell wall.

    • True
    • False
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About This Quiz

Explore the intricate process of virus multiplication and the nature of Mycoplasma in this engaging Biology quiz. Assess your understanding of viral attachment, uncoating, and the differences between animal viruses and bacteriophages. A great tool for students preparing for advanced biology exams.

A Biology Quiz About Mycoplasma! - Quiz

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  • 2. 

    Mycoplasmas are pleomorphic organisms that have a cell wall.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Mycoplasmas are pleomorphic organisms that do not have a cell wall.

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  • 3. 

    Mycoplasma grows _____ and are highly fastidious, facultative anerobes.

    • Rapidly

    • Slowly

    Correct Answer
    A. Slowly
    Explanation
    Mycoplasma grows slowly because they are highly fastidious, meaning they have specific nutritional requirements that are difficult to meet. They are also facultative anaerobes, which means they can grow with or without oxygen but prefer low oxygen environments. Due to their slow growth rate, it is important to provide the necessary nutrients and conditions for their survival and replication.

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  • 4. 

    Mycoplasma need complex media contain _______ and _______ for growth.

    • Blood and hemolysin

    • Glucose and galactose

    • Cholesterol and fatty acids

    Correct Answer
    A. Cholesterol and fatty acids
    Explanation
    Mycoplasma is a type of bacteria that lacks a cell wall, making it difficult to culture. It requires a complex media that contains specific nutrients for its growth. Cholesterol and fatty acids are essential components for the growth of Mycoplasma. These substances are necessary for the synthesis of the bacterial cell membrane, providing structural integrity and stability. Without cholesterol and fatty acids in the media, Mycoplasma would not be able to grow and replicate effectively. Therefore, the presence of cholesterol and fatty acids in the media is crucial for the growth of Mycoplasma.

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  • 5. 

    Mycoplasma grows _____ and are highly fastidious, facultative anerobes.

    • Rapidly

    • Slowly

    Correct Answer
    A. Slowly
    Explanation
    Mycoplasma grows slowly and are highly fastidious, facultative anaerobes. This means that they have a slow growth rate compared to other bacteria and require specific and complex nutrient conditions to survive. They can also survive in environments with or without oxygen.

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  • 6. 

    Why are Mycoplasma resistant to antibiotics such as penicillin and cephalosporins?

    • Their endotoxins makes them resistant

    • Their lack of a cell wall make them resistant

    • Their motility makes them resistant

    Correct Answer
    A. Their lack of a cell wall make them resistant
    Explanation
    Mycoplasma is resistant to antibiotics such as penicillin and cephalosporins because they lack a cell wall. The cell wall is the target for these antibiotics, as they disrupt the synthesis of the cell wall, leading to bacterial cell death. However, Mycoplasma does not have a cell wall, making them inherently resistant to these antibiotics.

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  • 7. 

    Mycoplasma need complex media contain _______ and _______ for growth.

    • Blood and hemolysin

    • Glucose and galactose

    • Cholesterol and fatty acids

    Correct Answer
    A. Cholesterol and fatty acids
    Explanation
    Mycoplasma is a type of bacteria that lacks a cell wall, making it highly dependent on the host for nutrients. Cholesterol and fatty acids are essential components for the growth and survival of Mycoplasma. They are needed for membrane stability and fluidity, as well as for the synthesis of various cellular components. Therefore, Mycoplasma requires complex media containing cholesterol and fatty acids to provide these crucial nutrients for its growth.

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  • 8. 

    Why are Mycoplasma resistant to antibiotics such as penicillin and cephalosporins?

    • Their endotoxins makes them resistant

    • Their lack of a cell wall make them resistant

    • Their motility makes them resistant

    Correct Answer
    A. Their lack of a cell wall make them resistant
    Explanation
    Mycoplasma are resistant to antibiotics such as penicillin and cephalosporins because they lack a cell wall. The cell wall is the target for these antibiotics, as they inhibit its synthesis. Since Mycoplasma do not have a cell wall, these antibiotics are unable to effectively target and kill the bacteria.

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  • 9. 

    True or false: Mycoplasma are the smallest free living ?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Mycoplasma are indeed the smallest free-living organisms. They are unique because they lack a cell wall, which allows them to take on various shapes and sizes. Despite their small size, Mycoplasma are capable of living independently and carrying out essential life processes. They are commonly found in animals and humans and can cause various infections and diseases.

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  • 10. 

    Why are Mycoplasma resistant to antibiotics such as penicillin and cephalosporins?

    • Their endotoxins makes them resistant

    • Their lack of a cell wall make them resistant

    • Their motility makes them resistant

    Correct Answer
    A. Their lack of a cell wall make them resistant
    Explanation
    Mycoplasma are resistant to antibiotics such as penicillin and cephalosporins because they lack a cell wall. The cell wall is the target for these antibiotics, as they work by inhibiting the synthesis of the cell wall. Since Mycoplasma do not have a cell wall, these antibiotics are ineffective against them.

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  • 11. 

    Mycoplasmal diseases have a high morbidity but low mortality

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Mycoplasma diseases are mainly economic problems because infected animals don't gain weight or convert feed very well

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  • 12. 

    Which is a definite human pathogen?

    • Mycoplasma hominis

    • Mycoplasma pneumoniae

    • Ureaplasma urealyticum

    Correct Answer
    A. Mycoplasma pneumoniae
    Explanation
    Mycoplasma pneumoniae is a definite human pathogen because it is known to cause respiratory infections in humans, particularly pneumonia. Unlike the other options, Mycoplasma pneumoniae is specifically associated with causing diseases in humans and has been extensively studied and identified as a pathogen responsible for respiratory illnesses.

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  • 13. 

    What makes Mycoplasmas resistant to Beta lactams?

    • Lack of cell wall

    • Tiny genome

    • L-form

    • Highly variable pumps

    Correct Answer
    A. Lack of cell wall
    Explanation
    Mycoplasmas are resistant to Beta lactams because they lack a cell wall. Beta lactams, such as penicillin, target and disrupt the cell wall of bacteria, leading to cell lysis and death. However, Mycoplasmas do not have a cell wall, making them inherently resistant to the action of Beta lactams. This lack of a cell wall also contributes to their unique characteristics, such as their small size and ability to take on different forms known as L-forms.

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  • 14. 

    Mycoplasmas are pleomorphic organisms that have a cell wall.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Mycoplasmas are pleomorphic organisms that do not have a cell wall.

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  • 15. 

    Most cells reproduce by procaryotic fission

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Most cells reproduce by prokaryotic fission, which is a form of asexual reproduction. In this process, the cell divides into two identical daughter cells. This is commonly observed in bacteria and archaea, which are prokaryotic organisms. Eukaryotic cells, on the other hand, typically reproduce through mitosis or meiosis, which involves more complex processes. Therefore, the statement that most cells reproduce by prokaryotic fission is true.

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  • 16. 

    Mycoplasma need complex media contain _______ and _______ for growth.

    • Blood and hemolysin

    • Glucose and galactose

    • Cholesterol and fatty acids

    Correct Answer
    A. Cholesterol and fatty acids
    Explanation
    Mycoplasma are a type of bacteria that lack a cell wall and have unique nutritional requirements. They cannot synthesize cholesterol and fatty acids on their own, so they require these compounds in their growth media. Cholesterol is important for stabilizing their cell membranes, while fatty acids are essential for energy production and membrane fluidity. Therefore, complex media containing cholesterol and fatty acids are necessary for the growth of Mycoplasma.

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  • 17. 

    Which of the following steps occurs during the multiplication of animal viruses but not during the multiplication of bacteriophages?

    • Assembly

    • Uncoating

    • Attachment

    • Biosynthesis

    • Penetration

    Correct Answer
    A. Uncoating
    Explanation
    During the multiplication of animal viruses, uncoating is a step that occurs but not during the multiplication of bacteriophages. Uncoating refers to the process where the viral capsid is removed or disassembled, allowing the viral genetic material to be released into the host cell. This step is necessary for animal viruses to release their genetic material and initiate the replication process within the host cell. In contrast, bacteriophages do not require uncoating as they inject their genetic material directly into the bacterial cell, bypassing the need for disassembly of a capsid.

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  • 18. 

    Certain plant diseases are caused by prions.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Only animals and mammals are included

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  • 19. 

    Mycoplasma grows _____ and are highly fastidious, facultative anerobes.

    • Rapidly

    • Slowly

    Correct Answer
    A. Slowly
    Explanation
    Mycoplasma grows slowly and is highly fastidious, meaning it has specific and demanding growth requirements. This characteristic makes it difficult to cultivate and study in the laboratory. Mycoplasma is also a facultative anaerobe, which means it can survive with or without oxygen.

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  • 20. 

    _______ is the first step of the multiplication of animal viruses.

    Correct Answer
    Attachment
    attachment
    Explanation
    The virus attaches to a protein or polysaccharide molecule (receptor) on the surface of a cell

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  • 21. 

    Mycoplasmas are intracellular organisms

    • True

    • False

    Correct Answer
    A. False
    Explanation
    They must have a very close association with host cells, but they are not intracellular.

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  • 22. 

    Why are Mollicutes pleomorphic?

    • Lacks a cell membrane

    • Lacks a rigid cell wall

    • None of the above

    • Option 4

    Correct Answer
    A. Lacks a rigid cell wall
    Explanation
    Mollicutes are pleomorphic because they lack a rigid cell wall. Unlike other bacteria, Mollicutes do not have a peptidoglycan layer in their cell wall, which provides structural support and shape to the cell. Without a rigid cell wall, Mollicutes are able to change their shape and adopt various forms, leading to their pleomorphic nature.

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  • 23. 

    An organism that does not require oxygen, grows better in the absence of oxygen but can survive in atmospheres containing molecular oxygen is known as a(n); answer in lowercase please or uppercase if necessary. 

    Correct Answer
    obligate anaerobe
    Explanation
    An obligate anaerobe is an organism that does not require oxygen for its survival and growth. In fact, it grows better in the absence of oxygen. However, it can still survive in environments that contain molecular oxygen, although it may not thrive under such conditions.

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  • 24. 

    At the end of the Gram-staining procedure, Gram-positive bacteria should be: _______ . (Please answer lowercase with hyphen- if necessary). 

    Correct Answer
    blue-purple
    Explanation
    At the end of the Gram-staining procedure, Gram-positive bacteria should appear blue-purple. This is because Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet dye used in the staining process. The dye gives the bacteria a blue-purple color under a microscope.

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  • 25. 

    The group of bacteria that lack rigid cell walls and take on irregular shapes are known as: _____________ (answer in lower case for this question)

    Correct Answer
    mycoplasmas
    Explanation
    Mycoplasmas are a group of bacteria that lack rigid cell walls and have irregular shapes. They are unique among bacteria because they do not have a peptidoglycan layer in their cell walls, which gives them the ability to take on various shapes. This lack of a rigid cell wall also makes mycoplasmas resistant to many antibiotics that target cell wall synthesis. Mycoplasmas are often found as commensal or pathogenic organisms in humans and animals, causing diseases such as pneumonia, urinary tract infections, and sexually transmitted infections.

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  • 26. 

    Which of the following are parts of the multiplication of bacteriophages?

    • Attachment

    • Penetration

    • Biosynthesis

    • Phage Process

    • Assembly

    • Bacillus

    • Release

    Correct Answer(s)
    A. Attachment
    A. Penetration
    A. Biosynthesis
    A. Assembly
    A. Release
    Explanation
    The multiplication process of bacteriophages involves several stages. Attachment refers to the initial binding of the phage to the bacterial cell surface. Penetration involves the injection of the phage's genetic material into the host cell. Biosynthesis is the stage where the phage takes over the host cell's machinery to replicate its own genetic material and produce viral components. Assembly refers to the process of assembling new phage particles using the replicated genetic material and viral components. Release is the final stage where the newly formed phage particles are released from the host cell to infect other bacterial cells. Bacillus is not a part of the multiplication process of bacteriophages.

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  • 27. 

    Mycoplasma pneumoniae

    Correct Answer(s)
    Causes acute respiratory diease, may cause meningoencephalitis. Normal flora in oropharynx.
    Explanation
    The given answer states that Mycoplasma pneumoniae causes acute respiratory disease and may also cause meningoencephalitis. It further mentions that it is a normal flora in the oropharynx. This implies that Mycoplasma pneumoniae is a bacterium that can lead to respiratory infections and potentially affect the brain and its surrounding tissues. Additionally, it is a part of the normal microbial community found in the oropharynx.

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  • 28. 

    Why is Mycoplasma unstainable ?

    Correct Answer(s)
    Because they have no peptioglycan in their cell walls.
    Explanation
    Mycoplasma is unstainable because it lacks peptidoglycan in its cell walls. Peptidoglycan is a component of bacterial cell walls that provides rigidity and structure. Since Mycoplasma lacks this component, traditional staining methods that target peptidoglycan, such as Gram staining, cannot be used to stain and visualize these bacteria. Instead, special staining techniques, such as fluorescent dyes or DNA-specific stains, are required to observe Mycoplasma under a microscope.

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  • 29. 

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 19, 2015
    Quiz Created by
    Patricia Kelly
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