Lectins are proteins or glycoproteins that cause cells with suitable surface receptors to stick or clump together. Clumping depends on cell and lectin numbers in proper ratios. Why would little or no cell clumping occur if lectin numbers are too low with respect to cell numbers or too high with respect to cell numbers?
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Lectins are proteins or glycoproteins that cause cells with suitable surface receptors to stick or clump together. Clumping depends on cell and lectin numbers in proper ratios. Why would little or no cell clumping occur if lectin numbers are too low with respect to cell numbers or too high with respect to cell numbers?
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- The structure of a plant cell wall needs to loosen to accommodate cell growth. What signaling molecule controls this process?"given the numerous processes inside cells that are regulated by changes in Ca+2 concentration, it seems likely that Ca¹²-dependent cell-cell adhesions are also regulated by changes in Ca2 concentration" is true or false.Which of the following exert their cell signaling ability by directly phosphorylating other proteins? multiple answers A. RAS B. Epidermal Growth factor C. HER2 D. SRC E. Estrogen Receptor
- Which of the following changes to the microtubule binding protein, Tau, commonly occurs in Alzheimerâ s and other neurodegenerative diseases? A Tau is hypo-phosphorylated and does not bind to microtubules to destabilize them. B Tau levels are so low in the cell that they only bind to some microtubules. C Tau is hyper-phosphorylated and does not bind to microtubules to stabilize them. D Microtubules are hyper-phosphorylated and do not bind to Tau.Which of the following describes a mechanism by which microtubules are known to be stabilized? Conformational changes undertaken by beta-tubulin as it hydrolyzes GTP. Binding of microtubule binding proteins, such as Tau. Shortening of the GTP cap. Increasing the proportion of alpha-tubulin subunits relative to beta-tubulin subunits.Chemotaxis is a process by which cells migrate toward higher concentrations of a signaling molecule. The signaling molecule binds cell-surface receptors that result in actin polymerization at the cell membrane. Actin polymerization results in the formulation of filamentous actin that exerts a force and leads to protrusion of the leading edge. A researcher tested Compound A on chemotaxing cells and measured the relative amount of filamentous actin found in the cells at different times. Use the EGF Pathway passage to answer the questions. Part A Which of these structures, if present in a prokaryote, would prevent the organism from using this type of actin polymerization to chemotax toward a signal? A. cell wall B. flagellum C. mitochondrion D. ribosome Part B In the model proposed, which of these events MOST likely occurs to facilitate chemotaxis? A. Integrins anchor the cell to extracellular components. B. Motor proteins move actin toward the leading edge. C. Mitochondria migrate…
- Chemotaxis is a process by which cells migrate toward higher concentrations of a signaling molecule. The signaling molecule binds cell-surface receptors that result in actin polymerization at the cell membrane. Actin polymerization results in the formulation of filamentous actin that exerts a force and leads to protrusion of the leading edge. A researcher tested Compound A on chemotaxing cells and measured the relative amount of filamentous actin found in the cells at different times. Use the EGF Pathway passage to answer the questions. Part B In the model proposed, which of these events MOST likely occurs to facilitate chemotaxis? A. Integrins anchor the cell to extracellular components. B. Motor proteins move actin toward the leading edge. C. Mitochondria migrate away from the leading edge. D. Desmosomes anchor the cell to other cells. My answer to Part B is (b) motor proteins move actin toward the leading edge. But your answer is (d). Can you please explain why B…Cytokinesis , or division of the cytoplasm to create two new daughter cells , occurs in conjunction with telophase . Examine the telophase micrographs of the onion root tip and whitefish blastodisc cells . How does cytokinesis look different for these two cells ? Explain why cytokinesis looks different between those cellsIn plants, the cell wall forms as a young plant cell secretes polysaccharides onto the outer surface of its plasma membrane. Being thin and pliable, this primary wall allows the cell to enlarge and change shape. At maturity, cells in some plant tissues deposit material onto the primary wall’s inner surface. Why doesn’t this secondary wall form on the outer surface of the primary wall?
- Cell motility has been described as being like the motion of tank treads. At the leading edge, actin filaments form rapidly into bundles and networks that make protrusions and move the cell forward. At the rear, cell adhesions are broken and the tail end of the cell is brought forward. What provides the traction for moving cells? How does cell-body translocation happen? How are cell adhesions released as cells move forward?Which of the following exert their cell signaling ability proteteolysis of other proteins? multiple answers A. RAS B. Epidermal Growth factor C. Notch Receptor D. TGF-Beta Receptor E. Estrogen ReceptorWhy is syntrophy also called “interspeciesH2 transfer”? When does syntrophy not involveH2 transfer?