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The text claims that the evolution of an oxygen-rich atmosphere paved the way for increasingly efficient cellular respiration and higher growth rates in organisms. Explain.
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Ch. 26 - Bacteria and Archaea
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 26, Problema 9
Streptococcus mutans obtains energy by oxidizing sucrose. This bacterium is abundant in the mouths of Western European and North American children and is a prominent cause of cavities. The organism is virtually absent in children from East Africa, where tooth decay is rare. Propose a hypothesis to explain this observation. Outline the design of a study that would test your hypothesis.
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Step 1: Formulate a hypothesis based on the observation. A possible hypothesis could be: 'The absence of Streptococcus mutans in East African children is due to dietary differences, particularly lower consumption of sucrose, which reduces the bacterium's energy source and thus its prevalence and the incidence of cavities.'
Step 2: Design a study to test the hypothesis. Begin by selecting a sample of children from both Western Europe/North America and East Africa. Ensure that the sample is representative in terms of age, health status, and other relevant factors.
Step 3: Collect data on the children's diets, specifically focusing on sucrose intake. This could involve food frequency questionnaires, 24-hour dietary recalls, or direct observation of eating habits.
Step 4: Measure the prevalence of Streptococcus mutans in the mouths of the children using oral swabs followed by microbial culture techniques or molecular methods to identify and quantify the bacterium.
Step 5: Analyze the data to see if there is a correlation between sucrose intake and the presence of Streptococcus mutans, and subsequently, the incidence of cavities. Use statistical methods to determine if the differences observed are significant, while controlling for potential confounding factors.
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Metabolism of Streptococcus mutans
Streptococcus mutans is a bacterium that metabolizes sucrose through fermentation, producing lactic acid as a byproduct. This acid can demineralize tooth enamel, leading to cavities. Understanding its metabolic pathways is crucial for hypothesizing why its prevalence correlates with dental health in different populations.
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Metabolic Rate
Ecological Factors in Oral Microbiome
The oral microbiome consists of various microorganisms that interact with each other and their environment. Factors such as diet, hygiene practices, and cultural differences can influence the composition of this microbiome, potentially explaining the absence of S. mutans in certain populations and their lower incidence of cavities.
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03:25The Human Microbiome
Hypothesis Testing and Study Design
Formulating a hypothesis involves making a testable prediction based on observations. A well-designed study to test this hypothesis would include comparing dietary habits, oral hygiene practices, and the presence of S. mutans in different populations. This could involve cross-sectional surveys or longitudinal studies to establish causal relationships.
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03:02Test Crosses
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