Textbook Question
Summarize the experimental evidence in sponges showing that animal cells adhere to each other selectively. Explain the molecular basis of selective adhesion.
Ch. 11 - Cell-Cell Interactions
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- 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
Chapter 11, Problem 3
Which of the following actions correctly describe a role performed by at least one type of intercellular connection? Select True or False for each statement.
T/FAllows communication between adjacent cells.
T/FForms a watertight barrier between the cells.
T/FUses components of the extracellular matrix to indirectly connect adjacent cells.
T/FAssociates with cytoskeletal components to resist pulling forces.
Verified step by step guidance1
Understand the types of intercellular connections: gap junctions, tight junctions, desmosomes, and hemidesmosomes, each with distinct roles.
Gap junctions allow communication between adjacent cells by permitting the passage of ions and small molecules. This statement is True.
Tight junctions form a watertight barrier between cells, preventing the passage of substances between them. This statement is True.
Desmosomes use components of the extracellular matrix to indirectly connect adjacent cells, providing structural support. This statement is True.
Desmosomes and hemidesmosomes associate with cytoskeletal components to resist pulling forces, providing mechanical stability. This statement is True.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Intercellular Connections
Intercellular connections are structures that facilitate interaction between adjacent cells. They include tight junctions, gap junctions, and desmosomes, each serving distinct functions such as communication, forming barriers, or providing structural support. Understanding these connections is crucial for determining how cells interact and maintain tissue integrity.
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Intracellular Receptors
Tight Junctions
Tight junctions are specialized connections between epithelial cells that create a watertight seal, preventing the passage of molecules and ions through the space between cells. This barrier function is essential in maintaining distinct environments on either side of the epithelial layer, such as in the intestines or blood-brain barrier.
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Gap Junctions
Gap junctions are intercellular channels that allow direct communication between adjacent cells by permitting the passage of ions and small molecules. These junctions are crucial for coordinating activities such as electrical signaling in cardiac and smooth muscle tissues, enabling synchronized contraction and function.
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Related Practice
Textbook Question
Where are protein components of the extracellular matrix synthesized?
a. In the rough ER
b. In the Golgi apparatus
c. In the plasma membrane
d. In the extracellular layer itself
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Textbook Question
What does it mean to say that a signal is transduced?
a. The signaling molecule enters the cell directly and elicits a cellular response.
b. The signal is generated by the production of proteins.
c. The physical form of the signal changes between the outside of the cell and the inside.
d. The signal is amplified.
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Textbook Question
How do the extracellular filaments in plants differ from those in animals?
a. Plant filaments resist compression forces; animal filaments resist pulling forces.
b. Animal filaments consist of proteins; plant filaments consist of polysaccharides.
c. Plant extracellular filaments never move; animal filaments can slide past one another.
d. Plant filaments run parallel to one another; animal filaments crisscross.
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