BIOLOGICAL SCIENCE >C<
3rd Edition
ISBN: 9781323325292
Author: Freeman
Publisher: PEARSON C
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Chapter 11, Problem 6TYU
Summarize the experimental evidence in sponges showing that animal cells adhere to each other selectively. Explain the molecular basis of selective adhesion.
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Chapter 11 Solutions
BIOLOGICAL SCIENCE >C<
Ch. 11 - What is a fiber composite? How do cellular fiber...Ch. 11 - Prob. 2TYKCh. 11 - Prob. 3TYKCh. 11 - Prob. 4TYKCh. 11 - Prob. 5TYUCh. 11 - Summarize the experimental evidence in sponges...Ch. 11 - 7. QUANTITATIVE Suppose you were to model...Ch. 11 - What is the significance of the observation that...Ch. 11 - Prob. 9TYPSSCh. 11 - Prob. 10TYPSS
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- Cadherins are calcium-dependent adhesion proteins. They are homophilic proteins found in cell-cell adhesion. Answer the following. a. Explain what is meant by the term homophilic in this context. b. In what kind of cell-cell junction are cadherins found?arrow_forwardSummarize the major types of selective cell-cell adhesions. Describe the structure and role of tight junctions in epithelial sheets and adhesion junctions and gap junctions in all tissues. Explain the function of signaling receptors and their ligands in cell-cell interactionsarrow_forwardCadherin molecules are adhesion molecules found on the cell surface. These molecules are often clustered side-to-side to create a form of molecular Velcro that attaches one cell to another cell or to the extracellular matrix. In the following drawings, two cells are initially attached via such a Velcro. When one of the cells moves in either of three different ways (A to C), it is faced with a mechanical resistance from the cadherin interactions. The resistance against which type of movement do you think is the weakest? Two neighboring cells D. The cell moves away from its neighbor A. Two neighboring cells B. The cell moves away from its neighbor OC. The cell slides past its neighbor D. The cell rolls over its neighbor The cell slides past its neighbor C The cell rolls over its neighborarrow_forward
- Explain the cohesion-tension theory.arrow_forwardGive typing answer with explanation and conclusion Which of the following steps in vesicular transport occurs last? Group of answer choices Disassembly of vesicular coats Assembly of the SNARE complex Assembly of vesicular coats Association of Rab with Rab effector Disassembly of the SNARE complex?arrow_forwardAccording to ‘Contriving Decent Demonstrations’ section of Vogel (1994), what is the connection between molecular diffusion at the level of the cell and multicellular complexity at the level of the organism?(Please according to Vogel (1994)) in 2 to 3 sentencesarrow_forward
- What are the roles of adhesion molecules – CAMs. What five families of protein fit into this category? What are their structures?arrow_forwardDr Renko studied diffusion of tracer molecules to study paracellular diffusion across an epithelial monolayer of Caco-2 cells. The tracers were fluorescently labelled dextran molecules of different molecular weight. She is screening various drugs to determine whether they affect the cells in any way. Which drugs are most likely to change paracellular diffusion? a.) Drugs that modify microvilli are the most likely to change paracellular diffusion b.) Drugs that modify gap junctions are the most likely to change paracellular diffusion c.) Drugs that modify with aquaporins are the most likely to change paracellular diffusion d.) Drugs that modify tight junctions are the most likely to change paracellular diffusionarrow_forwardWhat is Anchorage Dependence? Describe the different Cell Junctions in Animal cells. What is the only Cell Junction in Plant cells? Why do Plant cells only have one type of Cell Junction? Explain Cell-Cell signaling involving Signal Transduction and G-Proteins.arrow_forward
- In a monolayer of cultured epithelial cells, the cells may or may not have formed tight junctions. What experimental test could be used to determine it the cells have functional tight junction structures? Place a small dye (1 k Da in molecular weight) into the culture media of cells cultured on a glass coverslip and use live imaging to monitor whether the dye can penetrate into the O cytoplasm of the cells, as would be expected if the cells have functional tight junctions. Inject a cell with a small dye (<1 kDa in molecular weight) and use live cell imaging to track whether the dye moves into neighboring cells, as would be expected if the cells have functional O tight junctions.arrow_forwardAnalogs of hemidesmosomes are the focal contact sites, which are also sites where the cell attaches to the extracellular matrix. These junctions are prevalent in fibroblasts but largely absent in epithelial cells. on the other hand, hemidesmosomes are prevalent in epithelial cells but absent in fibroblasts. In focal contact sites, intracellular connections are made to actin filaments, whereas in hemidesmosomes connections are made to intermediate filaments. Why do you suppose these two different cell types attach differently to the extracellular matrix?arrow_forwardBelow is a list of molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (slowest < fastest). Alanine (amino acid), estrogen (steroid), Propanol (alcohol), sodium (salt) O a. estrogen < sodium < propanol < alanine O b. estrogen < propanol < alanine < sodium O c. alanine < propanol < sodium < estrogen O d. sodium < alanine < propanol < estrogenarrow_forward
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