Domanda del libro di testo
The activation of receptor tyrosine kinases is characterized by
a. Dimerization and phosphorylation
b. Dimerization and IP3 binding.
c. A phosphorylation cascade
d. GTP hydrolysis
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Ch. 11 - Cell Communication
Urry12th EditionCampbell BiologyISBN: 9785794169850
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TOC.tableOfContents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology7
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Capitolo 11, Problema 3
Lipid-soluble signaling molecules, such as aldosterone, cross the membranes of all cells but affect only target cells because
a. Only target cells retain the appropriate DNA segments.
b. Intracellular receptors are present only in target cells.
c. Only target cells have enzymes that break down aldosterone.
d. Only in target cells is aldosterone able to initiate the phosphorylation cascade that turns genes on.
Guida verificata passo dopo passo1
Understand the nature of lipid-soluble signaling molecules: These molecules can easily cross cell membranes due to their ability to dissolve in the lipid bilayer.
Recognize that not all cells respond to lipid-soluble signals: Although these molecules can enter any cell, only specific cells, known as target cells, will respond to them.
Identify the role of intracellular receptors: Target cells have specific receptors inside the cell that bind to the signaling molecule. This binding is crucial for the signal to have an effect.
Consider the options given: Evaluate each option based on your understanding of how lipid-soluble signaling molecules work. Focus on the presence of intracellular receptors in target cells.
Conclude which option correctly explains why only target cells are affected: The correct answer involves the presence of intracellular receptors in target cells, which bind the signaling molecule and initiate a cellular response.
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Lipid-soluble signaling molecules
Lipid-soluble signaling molecules, such as steroid hormones, can easily pass through cell membranes due to their hydrophobic nature. These molecules typically bind to intracellular receptors, which are located within the cytoplasm or nucleus of target cells, allowing them to directly influence gene expression and cellular function.
Video consigliato:
04:19
Lipids
Intracellular receptors
Intracellular receptors are proteins located inside the cell, either in the cytoplasm or nucleus, that bind to lipid-soluble signaling molecules. Upon binding, these receptors often act as transcription factors, directly affecting gene expression by interacting with specific DNA sequences, thus influencing cellular responses.
Video consigliato:
02:28Intracellular Receptors
Target cells
Target cells are specific cells that respond to signaling molecules due to the presence of specific receptors. In the context of lipid-soluble molecules like aldosterone, only target cells possess the intracellular receptors necessary for binding the molecule, which allows them to initiate specific cellular responses, such as changes in gene expression.
Video consigliato:
02:50Synaptic Cell Signaling
Pratica correlata
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Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
a. Enzymatic activity was proportional to the amount of calcium added to a cell-free extract.
b. Receptor studies indicated that epinephrine was a ligand.
c. Glycogen breakdown was observed only when epinephrine was administered to intact cells.
d. Glycogen breakdown was observed only when epinephrine and glycogen phosphorylase were mixed.
1425
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Domanda del libro di testo
Consider this pathway: epinephrine → G protein-coupled receptor → G protein → adenylyl cyclase → cAMP. Identify the second messenger.
a. cAMP
b. G protein
c. GTP
d. Adenylyl cyclase
2358
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Domanda del libro di testo
Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of substances on opposite sides of the membrane?
a. Intracellular receptor
b. G protein-coupled receptor
c. Phosphorylated receptor tyrosine kinase dimer
d. Ligand-gated ion channel
1590
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Domanda del libro di testo
Apoptosis involves all but which of the following?
a. Fragmentation of the DNA
b. Cell-signaling pathways
c. Lysis of the cell
d. Digestion of cellular contents by scavenger cells
2490
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