Domanda del libro di testo
Steroid hormones, like most lipid-soluble signaling molecules, are processed directly. How does the absence of a signal transduction cascade in the processing of steroid hormones affect (b) signal regulation?
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Ch. 11 - Cell-Cell Interactions
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 11, Problema 7
Suppose you were to model amplification by the phosphorylation cascade in Figure 11.16, using a penny for each kinase 1, a nickel for each kinase 2, and a dime for each kinase 3. Also suppose that Ras and each of the kinases can activate 10 proteins. How much money would you need to construct your model?
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Identify the number of each type of kinase at each step of the cascade. Since each kinase can activate 10 proteins, and there are 3 steps in the cascade, calculate the total number of kinases activated at each step. Start with 1 Ras activating 10 kinase 1, each kinase 1 activates 10 kinase 2, and each kinase 2 activates 10 kinase 3.
Calculate the total number of kinase 1, kinase 2, and kinase 3. Kinase 1: 10, Kinase 2: 10 x 10 = 100, Kinase 3: 10 x 100 = 1000.
Determine the monetary value of each type of kinase. Use a penny (1 cent) for each kinase 1, a nickel (5 cents) for each kinase 2, and a dime (10 cents) for each kinase 3.
Calculate the total cost for each type of kinase. Cost for kinase 1: 10 pennies = 10 cents, Cost for kinase 2: 100 nickels = 100 x 5 = 500 cents, Cost for kinase 3: 1000 dimes = 1000 x 10 = 10000 cents.
Add up the total cost for all kinases to find out how much money you would need for the model. Total cost = 10 cents (kinase 1) + 500 cents (kinase 2) + 10000 cents (kinase 3) = 10510 cents or \$105.10.
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Phosphorylation Cascade
A phosphorylation cascade is a series of biochemical events where one enzyme phosphorylates another, leading to a chain reaction that amplifies a signal within a cell. This process is crucial in cellular signaling pathways, allowing a small initial signal to produce a large response, often involving multiple kinases that sequentially activate each other.
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02:35
Phosphorylation Cascades
Kinases
Kinases are enzymes that catalyze the transfer of phosphate groups from high-energy molecules, like ATP, to specific substrates, typically proteins. This phosphorylation can alter the activity, localization, or function of the target proteins, playing a vital role in regulating various cellular processes, including metabolism, cell division, and signal transduction.
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02:35Phosphorylation Cascades
Signal Amplification
Signal amplification refers to the process by which a small initial signal is greatly increased through a series of biochemical reactions, often involving kinases and other signaling molecules. In the context of the phosphorylation cascade, each activated kinase can trigger the activation of multiple downstream proteins, resulting in a significant enhancement of the cellular response to the original signal.
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06:10Signal Amplification
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Steroid hormones, like most lipid-soluble signaling molecules, are processed directly. How does the absence of a signal transduction cascade in the processing of steroid hormones affect (a) signal amplification?
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What does it mean to say that a signal is transduced?
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d. The signal is amplified.
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How do the extracellular filaments in plants differ from those in animals?
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b. Animal filaments consist of proteins; plant filaments consist of polysaccharides.
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