Textbook Question
If there are 47 cells in 1 μl of sewage, how many cells are there in a liter?
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Ch. 6 - Microbial Nutrition and Growth
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 6, Problem 10
In a defined medium:
a. The exact chemical composition of the medium is known
b. Agar is available for microbial nutrition
c. Blood may be included
d. Organic chemicals are excluded
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Step 1: Understand the definition of a defined medium in microbiology. A defined medium is a growth medium where all the chemical components and their exact amounts are known.
Step 2: Analyze option (a): 'The exact chemical composition of the medium is known.' This aligns with the definition of a defined medium.
Step 3: Analyze option (b): 'Agar is available for microbial nutrition.' Agar is typically used as a solidifying agent, not a nutrient source, so this is not a defining feature of a defined medium.
Step 4: Analyze option (c): 'Blood may be included.' Blood is usually added to complex or enriched media, not defined media, because its exact composition is not known.
Step 5: Analyze option (d): 'Organic chemicals are excluded.' Defined media often contain organic chemicals, but their exact amounts are known, so this statement is incorrect.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Defined Medium
A defined medium is a growth medium in which all the chemical components and their exact concentrations are known. It allows precise control over the nutrients available to microorganisms, facilitating studies on microbial metabolism and nutritional requirements.
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01:53
Chemically Defined Media
Complex vs. Defined Media
Complex media contain ingredients like blood, yeast extract, or peptones with unknown exact chemical compositions, while defined media have chemically pure components. This distinction is important for experiments requiring controlled nutrient conditions.
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Role of Agar in Microbiology
Agar is a solidifying agent derived from seaweed, commonly used in culture media to provide a surface for microbial growth. It is generally inert nutritionally and does not serve as a nutrient source for microbes.
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Related Practice
Textbook Question
A student observes a researcher streaking a plate numerous times, flaming the loop between streaks. The researcher is likely using the ___________ method to isolate microorganisms.
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Textbook Question
List three indirect methods of counting microbes.
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Textbook Question
Which of the following terms best describes an organism that cannot exist in the presence of oxygen?
a. Obligate aerobe
b. Facultative aerobe
c. Obligate anaerobe
d. Facultative anaerobe
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Textbook Question
List five direct methods of counting microbes.
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Textbook Question
Which of the following is most useful in representing population growth on a graph?
a. Logarithmic reproduction of the growth curve
b. A semilogarithmic graph using a log scale on the y-axis
c. An arithmetic graph of the lag phase followed by a logarithmic section for the log, stationary, and death phases
d. None of the above would best represent a population growth curve
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