Textbook Question
Fill in the following blanks.
a. 1 μm = ______ m
b. 1= _______ 10⁻⁹ m
c. 1 μm = ______ nm
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Ch. 3 - Observing Microorganisms Through a Microscope
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398
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Table of contents
- Ch. 1 - The Microbial World and You18
- Ch. 2 - Chemical Principles20
- Ch. 3 - Observing Microorganisms Through a Microscope18
- Ch. 4 - Functional Anatomy of Prokaryotic and Eukaryotic Cells21
- Ch. 5 - Microbial Metabolism20
- Ch. 6 - Microbial Growth20
- Ch. 7 - The Control of Microbial Growth20
- Ch. 8 - Microbial Genetics19
- 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
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Not the one you use?Change textbook
Chapter 3, Problem 2
Three-dimensional images of live cells can be produced with:
a. Darkfield microscopy
b. Fluorescence microscopy
c. Transmission electron microscopy
d. Confocal microscopy
e. Phase-contrast microscopy
Verified step by step guidance1
Step 1: Understand the goal of the question, which is to identify the microscopy technique capable of producing three-dimensional images of live cells.
Step 2: Review each microscopy option and its capabilities: a) Darkfield microscopy enhances contrast but does not produce 3D images; b) Fluorescence microscopy highlights specific structures but typically produces 2D images; c) Transmission electron microscopy provides high-resolution images but requires fixed, dead samples and is 2D; d) Confocal microscopy uses laser scanning and optical sectioning to create detailed 3D images of live cells; e) Phase-contrast microscopy enhances contrast in transparent specimens but does not create 3D images.
Step 3: Focus on the principle of confocal microscopy, which involves scanning a specimen with a focused laser beam and collecting light from a single focal plane, allowing the construction of 3D images by stacking multiple optical sections.
Step 4: Recognize that confocal microscopy is uniquely suited for live cell imaging in three dimensions due to its ability to optically section specimens without physical slicing.
Step 5: Conclude that the correct answer is confocal microscopy, as it is the only technique listed that can produce three-dimensional images of live cells.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Confocal Microscopy
Confocal microscopy uses laser light and spatial pinholes to eliminate out-of-focus light, producing sharp, high-resolution images. It allows for optical sectioning of thick specimens, enabling the reconstruction of three-dimensional images of live cells.
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01:51
Confocal Scanning Laser Microscopes (CSLMs)
Fluorescence Microscopy
Fluorescence microscopy uses fluorescent dyes or proteins to label specific cell components, which emit light when excited by specific wavelengths. While it provides high contrast images, it typically produces two-dimensional images unless combined with techniques like confocal microscopy.
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02:54Fluorescence Microscopes
Transmission Electron Microscopy (TEM)
TEM uses electron beams transmitted through ultra-thin specimens to produce highly detailed images at the molecular level. However, it requires fixed, dead samples and cannot produce three-dimensional images of live cells.
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04:23Transmission Electron Microscope (TEM)
Related Practice
Textbook Question
Assume you stain Bacillus by applying malachite green with heat and then counterstain with safranin. Through the microscope, the green structures are
a. Cell walls
b. Capsules
c. Endospores
d. Flagella
e. Impossible to identify
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Textbook Question
Looking at the cell of a photosynthetic microorganism, you observe the chloroplasts are green in brightfield microscopy and red in fluorescence microscopy. You conclude:
a. Chlorophyll is fluorescent
b. The magnification has distorted the image
c. You’re not looking at the same structure in both microscopes
d. The stain masked the green color
e. None of the above
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Textbook Question
Which type of microscope would be best to use to observe each of the following?
a. A stained bacterial smear
b. Unstained bacterial cells: the cells are small, and no detail is needed
c. Unstained live tissue when it is desirable to see some intracellular detail
d. A sample that emits light when illuminated with ultraviolet light
e. Intracellular detail of a cell that is 1μm long
f. Unstained live cells in which intracellular structures are shown in color
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Textbook Question
Carbolfuchsin can be used as a simple stain and a negative stain. As a simple stain, the pH is:
a. 2
b. Higher than the negative stain
c. Lower than the negative stain
d. The same as the negative stain