Textbook Question
How does oxidation of a molecule occur without oxygen?
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Ch. 5 - Microbial Metabolism
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 5, Problem 6
Photosynthetic bacteria that also fix nitrogen are:
a. Mycoplasmas
b. Spirilla
c. Bacteroids
d. Cyanobacteria
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Understand the key terms in the question: 'photosynthetic bacteria' are bacteria that can perform photosynthesis, and 'fix nitrogen' means converting atmospheric nitrogen (N₂) into a form usable by living organisms, such as ammonia.
Recall that mycoplasmas are bacteria without cell walls and are not known for photosynthesis or nitrogen fixation, so option (a) can be ruled out.
Spirilla are spiral-shaped bacteria, but they are not typically photosynthetic nor known for nitrogen fixation, so option (b) is unlikely.
Bacteroids are differentiated forms of rhizobia bacteria inside legume root nodules that fix nitrogen but are not photosynthetic, so option (c) is not correct.
Cyanobacteria are well-known for their ability to perform oxygenic photosynthesis and some species can fix nitrogen, making option (d) the correct choice.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Photosynthetic Bacteria
Photosynthetic bacteria are microorganisms that can convert light energy into chemical energy through photosynthesis. Unlike plants, some bacteria use different pigments and pathways, such as bacteriochlorophyll, to capture light. Cyanobacteria are a well-known group of photosynthetic bacteria that produce oxygen as a byproduct.
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05:58
Pigments of Photosynthesis
Nitrogen Fixation
Nitrogen fixation is the biological process where certain bacteria convert atmospheric nitrogen (N2) into ammonia (NH3), a form usable by plants. This process is essential for the nitrogen cycle and supports plant growth. Some bacteria, including certain cyanobacteria, have specialized enzymes called nitrogenases to perform this function.
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07:215 Nitrogenous Bases
Cyanobacteria
Cyanobacteria are a group of photosynthetic bacteria capable of oxygenic photosynthesis and nitrogen fixation. They possess specialized cells called heterocysts that provide an anaerobic environment for nitrogenase activity. Cyanobacteria play a crucial role in aquatic ecosystems and soil fertility by contributing both oxygen and fixed nitrogen.
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Related Practice
Textbook Question
Explain the mechanism of negative feedback with respect to enzyme action.
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Textbook Question
For the phrase given below, indicate the type of metabolism referred to, using the following choices:
a. Anabolism only
b. Both anabolism and catabolism (amphibolic)
c. Catabolism only
Includes hydrolytic reactions
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Textbook Question
The final electron acceptor in aerobic respiration is ________.
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Textbook Question
Three common inorganic electron acceptors in anaerobic respiration are _______,_______, and _______.
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Textbook Question
Facultative anaerobes can live under either aerobic or anaerobic conditions. What metabolic pathways allow these organisms to continue to harvest energy from sugar molecules in the absence of oxygen?
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