Textbook Question
Acid-fast bacteria contain ___________________ in their cell wall.
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Ch. 1 - Introduction to Microbiology
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619
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Table of contents
- Ch. 1 - Introduction to Microbiology22
- Ch. 2 - Biochemistry Basics19
- Ch. 3 - Introduction to Prokaryotic Cells17
- Ch. 4 - Introduction to Eukaryotic Cells16
- Ch. 5 - Genetics25
- Ch. 6 - Viruses and Prions12
- Ch. 7 - Fundamentals of Microbial Growth20
- Ch. 8 - Microbial Metabolism16
- Ch. 9 - Principles of Infectious Disease and Epidemiology11
- Ch. 10 - Host Microbe Interactions and Pathogenesis19
- Ch. 11 - Innate Immunity24
- Ch. 12 - Adaptive Immunity22
- Ch. 13 - Immune System Disorders15
- Ch. 14 - Biomedical Applications: Vaccines, Diagnostics, Therapeutics, and Molecular Method14
- Ch. 15 - Antimicrobial Drugs18
- Ch. 16 - Respiratory System Infections16
- Ch. 17 - Skin and Eye Infections19
- Ch. 18 - Nervous System Infections12
- Ch. 19 - Digestive System Infections20
- Ch. 20 - Urinary and Reproductive System Infections10
- Ch. 21 - Cardiovascular and Lymphatic Infections15
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619Not the one you use?Change textbook
Chapter 1, Problem 21
Which of the following is true?
a. SEM is higher resolution than TEM.
b. Most viruses can be seen using a light microscope.
c. Simple staining involves an acidic and a basic dye in combination.
d. Samples can be stained or unstained for light microscopy.
e. These are all false statements.
Verified step by step guidance1
Step 1: Understand the difference between SEM (Scanning Electron Microscope) and TEM (Transmission Electron Microscope). SEM provides detailed 3D surface images, while TEM offers higher resolution images of internal structures. So, compare their resolution capabilities.
Step 2: Recall the size range of viruses and the resolving power of light microscopes. Light microscopes typically cannot resolve objects smaller than about 200 nanometers, while most viruses are smaller than this limit.
Step 3: Review the concept of simple staining in microbiology. Simple staining usually involves the use of a single basic dye to color cells, not a combination of acidic and basic dyes.
Step 4: Consider the types of samples used in light microscopy. Samples can indeed be either stained to enhance contrast or unstained (live or transparent samples) depending on the technique and purpose.
Step 5: Based on the analysis of each statement, determine which one is true by eliminating the false ones.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Electron Microscopy: SEM vs TEM
Scanning Electron Microscopy (SEM) provides detailed 3D surface images but generally has lower resolution than Transmission Electron Microscopy (TEM), which offers higher resolution images of internal structures by transmitting electrons through thin samples.
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Scanning Electron Microscope (SEM)
Microscopy of Viruses
Most viruses are too small to be seen with a light microscope due to their size being below the resolution limit (~200 nm). Electron microscopes are required to visualize viruses clearly.
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03:46Light Microscopy: Bright-Field Microscopes
Staining Techniques in Light Microscopy
Simple staining uses a single basic dye to color cells, enhancing contrast. Differential staining involves multiple dyes, including acidic and basic, but simple staining does not combine both types. Samples can be observed stained or unstained under light microscopy.
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03:46Light Microscopy: Bright-Field Microscopes
Related Practice
Textbook Question
What best describes the relationship between host and pathogen?
a. Mutualism
b. Parasitism
c. Commensalism
d. Endosymbiosis
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Textbook Question
Why is it clinically helpful to know the Gram property of an organism?
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Textbook Question
Over time, Koch’s disease postulates have been rephrased in a variety of ways, but they still reflect the same process outlined by Robert Koch. The following are reworded versions of Koch’s postulates. Based on the original postulates, put the following items in the correct order.
a. Use the purified agent to cause infection in a test animal.
b. Isolate an infectious agent from a diseased animal.
c. Grow the infectious agent as a pure culture in the lab.
d. From the test animal, re-isolate the infectious agent that was originally grown in pure culture.
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