Propose an experiment that would distinguish pore-mediated diffusion (e.g.,by gramicidin) from carrier-mediated diffusion (e.g., by valinomycin).
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Propose an experiment that would distinguish pore-mediated diffusion (e.g.,
by gramicidin) from carrier-mediated diffusion (e.g., by valinomycin).
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- Using appropriate examples, distinguish between passivetransport and facilitated diffusion.Which of the following statements is correct about passive diffusion? Select one: A) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). B) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). C) It requires an expenditure of energy by the cell. D) It may require a transport protein. E) It involves movement of molecules down a concentration gradient and may require a transport protein.Which of the following arrangement based on the increasing order of motion is correct?a) Uncatalysed transverse motion, transverse diffusion catalyzed by flippase, uncatalysed lateral diffusionb) Uncatalysed lateral diffusion, uncatalysed transverse motion, transverse diffusion catalyzed by flippase,c) Uncatalysed transverse motion, uncatalysed lateral diffusion, transverse diffusion catalyzed by flippased) Transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion, uncatalysed transverse motion,
- Define the terms (i) facilitated diffusion, (ii) primary active transport and (iii) secondary active transport. Identify which of these transport types the following are examples of: a) ATP/ADP translocase b) K^+ channels c) BacteriorhodopsinWhich of these answers explains why synaptic vesicles only releasee their neurotransmitter cargo in response to a signal? A) the necessary Rab proteins are not synthesized until an action potential arrives B) vesicle formation at the trans-Golgi network cannot occur in the absence of plasma membrane depolarization C) an additional protein, synaptotagmin, makes vesicle fusion dependent on the calcium concentration D)a plasma membrane transporter is needed to actively pump neurotransmitter into the synaptic cleft. These are inactive until membrane depolarizationDr 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 diffusion
- 1.) Select/highlight the statements that are TRUE regarding simple diffusion. a) It is a form of passive transport. b) It is how glucose travels across the cell membrane C) It is used to transport larger molecules such as polysaccharides. d) It is the method used to transport small, nonpolar molecules. 2.) What is the name of the process occurring in the diagram below and additionally, what is the name given to the condition/outcome/state created on the right side of the diagram below?Describe the two phenomena that give rise to the diversity of adhesion molecules such as cadherins. What additional phenomenon gives rise to the diversity of integrins?Define: simple diffusion, facilitated diffusion, primary active transport, secondary active transport and cotransport (by sure to address symport and antiport) . please explain this iin one sentense for each one please. note: I do not want more than one sentense
- Active transport pumps are used to move sodium ions across the membranes of gill cells in freshwater fish species. Which of the following statements about the pumps is accurate?Explain. a) There are specific binding sites for sodium ions on the pump b) They require osmosis to carry the sodium ions into the cell c) This is an example of passive diffusion and ATP is required d) Their lipid based structure allows it to embed in the cell membraneBoth active and passive transports can be subdivided further. Distinguish between the different pairs of terms below: a) simple diffusion vs. facilitated difussion b) Facilitated diffusion vs. active transport c) channel protein vs. carrier protein d) simple diffusion vs. osmosis e) Uniporter vs. symporter vs. antiporterThis graph shows facilitated diffusion of a compound across a cytoplasmic membrane and into a cell. As the external concentration of the compound is increased, the rate of uptake increases until it reaches a point where it slows and then begins to plateau. This is not the case with passive diffusion, where the rate of uptake continually increases as the solute concentration increases. Why does the rate of uptake slow and then eventually plateau with facilitated diffusion?