Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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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 (6th Edition)
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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- Cadherin 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_forwardCadherins 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_forwardMalcolm Steinberg tested this hypothesis by putting two cell types in a Petri dish and watching how they sorted: a. how did the sorting pattern that supported cell adhesion being the force of cell sorting differ from that of "directed movement" (i.e., cells independently were directed to move inward --in that direction)? (can draw pattern or describe in words) b. He could have tested it another way--by inhibiting or knocking down cadherins (cell adhesion molecules) with a chemical or by using CRISPR/CAS9--if he did, what do you predict cells would do when placed in a Petri dish? (can draw this outcome or describe in words)arrow_forward
- Give typed explanationarrow_forwardDescribe transmembrane proteins and explain the following roles that they play in the plasma membrane: receptor, enzyme, ion channel, carrier protein, cell-identity marker, and cell-adhesion molecule.arrow_forwardIn 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_forward
- Explain wellarrow_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_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_forward
- Below 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_forwardGen bio1arrow_forwardWhen the protein integrin (a transmembrane protein in human fibroblasts) is held in place, by covalent bonds to fibronectin and collagen proteins in the interstitial spaces, integrin is exhibiting: restricted movement in the membrane, based on confinement by diffusion barriers restricted movement in the membrane, based on tethering to extracellular molecules restricted movement in the membrane, based on attachment to other cells restricted movement in the membrane, based on anchoring to intracellular proteins unrestricted movement in the membrane, similar to membrane lipidsarrow_forward
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