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Identify the diseases based on the symptoms in the following chart.
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Ch. 21 - Microbial Diseases of the Skin and Eyes
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398
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TOC.tableOfContents
- Ch. 1 - The Microbial World and You18
- Ch. 2 - Chemical Principles20
- Ch. 3 - Observing Microorganisms Through a Microscope18
- Ch. 7 - The Control of Microbial Growth20
- Ch. 9 - Biotechnology & DNA Technology20
- Ch. 10 - Classification of Microorganisms15
- Ch. 11 - The Prokaryotes: Domains Bacteria and Archaea14
- Ch. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and Helminths17
- Ch. 13 - Viruses, Viroids, and Prions20
- Ch. 14 - Principles of Disease and Epidemiology21
- Ch. 15 - Microbial Mechanisms of Pathogenicity19
- Ch. 16 - Innate Immunity: Nonspecific Defenses of the Host20
- Ch. 17 - Adaptive Immunity: Specific Defenses of the Host20
- Ch. 18 - Practical Applications of Immunology20
- Ch. 19 - Disorders Associated with the Immune System19
- Ch. 20 - Antimicrobial Drugs19
- Ch. 21 - Microbial Diseases of the Skin and Eyes21
- Ch. 22 - Microbial Diseases of the Nervous System19
- Ch. 23 - Microbial Diseases of the Cardiovascular and Lymphatic Systems20
- Ch. 24 - Microbial Diseases of the Respiratory System20
- Ch. 25 - Microbial Diseases of the Digestive System20
- Ch. 26 - Microbial Diseases of the Urinary and Reproductive Systems19
- Ch. 27 - Environmental Microbiology20
- Ch. 28 - Applied and Industrial Microbiology19
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Tortora 14th EditionCh. 21 - Microbial Diseases of the Skin and EyesProblema 6
Tortora 14th EditionCh. 21 - Microbial Diseases of the Skin and EyesProblema 6Capitolo 17, Problema 6
You microscopically examine scrapings from a case of Acanthamoeba keratitis. You expect to see
a. Nothing.
b. Viruses.
c. Gram-positive cocci.
d. Eukaryotic cells.
e. Gram-negative cocci.
Guida verificata passo dopo passo1
Step 1: Understand the organism involved. Acanthamoeba is a genus of free-living amoebae, which are eukaryotic protozoa, not bacteria or viruses.
Step 2: Recall the characteristics of eukaryotic cells. They have a defined nucleus and other membrane-bound organelles, which can be seen under a microscope when examining scrapings.
Step 3: Consider what you would expect to see microscopically in a case of Acanthamoeba keratitis. Since Acanthamoeba is a eukaryote, you would expect to see eukaryotic cells rather than bacteria (which are prokaryotic) or viruses (which are not visible by light microscopy).
Step 4: Eliminate options that do not fit. Viruses are too small to be seen with a light microscope, and gram-positive or gram-negative cocci are types of bacteria, which are not the causative agent here.
Step 5: Conclude that the correct microscopic observation would be eukaryotic cells, consistent with the presence of Acanthamoeba.
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Acanthamoeba Biology
Acanthamoeba is a genus of free-living amoebae that are eukaryotic microorganisms. They have a nucleus and membrane-bound organelles, distinguishing them from bacteria and viruses. Acanthamoeba can cause keratitis, an infection of the cornea, especially in contact lens users.
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03:03
Basic Theories of Biology
Microscopic Identification of Microorganisms
Microscopic examination helps differentiate microorganisms based on size, structure, and staining properties. Eukaryotic cells like Acanthamoeba are larger and have visible nuclei, unlike bacteria which are smaller and prokaryotic. Viruses are too small to be seen with a light microscope.
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03:46Light Microscopy: Bright-Field Microscopes
Gram Staining and Microbial Classification
Gram staining differentiates bacteria into gram-positive (purple) and gram-negative (pink) based on cell wall structure. Cocci refer to spherical bacteria. Since Acanthamoeba is a eukaryote, it does not stain with Gram stain and is not classified as gram-positive or gram-negative cocci.
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04:57Gram Stain
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