Compare and fully explain simple diffusion and facilitated diffusion of solutes across a plasma membrane. How are they similar and how are they different? Your answer must include a discussion of concentration gradients, transport proteins and energy (ATP) requirements. Describe the general properties of molecules/solutes that exhibit each type of diffusion,
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- One of the curves in this graph describes nonmediated diffusion, and the other describes facilitated transport. Which is which? Explain your choices.Provide 2 examples of Diffusion, Osmosis, and Semi-Permeable Membrane (1 from the "Diffusion Through a Membrane" lab and 1 from any biological situation) and explain how those examples illustrates the concept.The image below shows the movement of molecules across a plasma membrane. extracellular space lipid bilayer (cell membrane) TIMEI Source: LadyofHats small hydrophobic molecules intracellular space Using the image above, answer the following questions. (a) Identify the type of cell transport that is occurring in the image and justify your answer. (b) Explain the fluid mosaic model of the cell membrane as i relates to the movement of mole- cules illustrated in the figure. answer. (c) Predict the difference you would expect to see in the movement of illustrated molecules if they were to represent hydrophilic molecules rather than hydrophobic molecules. Justify your
- A B ATP Identify the types of transport happening in the pictures above. Compare and contrast these 2 types of transport. Include information such as direction of movements, energy usage, and types of materials transported. Claim: Identify the type of transport happening in both pictures A and B. Be specific - If it is passive transport, what kind (diffusion, osmosis, or facilitated diffusion)? If it is active transport, what kind (endocytosis, exocytosis, or membrane pump)?Consider a solute having a permeability coefficient of 10-6 m s-1 for the plasma membrane of a cylindrical Chara cell that is 100 mm long and 1 mm in diameter. Assume that its concentration remains essentially uniform within the cell. Untitled Title A. How much time would it take for 90% of the solute to diffuse out into a large external solution initially devoid of that substance?* B. How much time would it take if diffusion occurred only at the two ends of the cell?* C. How would the times calculated in A and B change for 99% of the solute to diffuse out? D. How would the times change if Pj were 10-8 m s-1?*The comparison of the simple diffusion, facilitated diffusion and active transport are shown in the table below: * Which comparisons are TRUE? Simple Diffusion Facilitated Diffusion Active Transport I Require ATP Does not require ATP Require ATP II Does not involve a Involve a transport Involve a transport transport protein protein protein From a region of higher III From a region of higher concentrațion of substance to a region of lower concentration of From a region of lower concentration of concentration of substance to a region of lower concentration of substance. substance to a region of higher concentration of substance. substance. O I and II only I and III only O Il and III only O I, Il and III
- For each of the following scenarios described where a molecule or ion is moving from one side of a membrane to the other, select the method by which the molecule or ion is moving. Each answer can be used more than once, or not at all. - Simple Diffusion - Facilitated diffusion by a channel protein - Facilitated diffusion by a carrier/transport protein - Active transport by a pump - Could be facilitated diffusion by a channel or a carrier; not enough information is given A- While water can freely diffuse across the membrane, it does not do so fast enough for living organisms to function properly. Therefore, membrane proteins known as aquaporins can increase the rate at which water moves across the membrane. The movement of water across the membrane via aquaporins (which do not change shape) is an example of which type of transport? B-Many snake venoms induce paralysis by acting on acetylcholine receptors. Nicotinic acetylcholine receptors are transmembrane proteins that allow Na+, K+…In what direction is there a net movement of particles along their concentration gradient? Would your answers be different for facilitated diffusion compared with simple diffusion?Below are three statements - two of which are truths and one is a lie. Which of the following statements is a lie? Select one: a.The primary active transport uses external chemical energy. b.The sodium-potassium pump which is an example of primary active transport is considered as the most important pump. c. In primary active transport, the energy is derived secondarily from energy that has been stored in the form of ionic concentration differences between the two sides of a membrane.
- In Chapters 11 & 12, the following examples of membrane transport proteins are given. Fill out the table with the correct answer for that particular transport protein. Type of transport protein (channel or carrier/transporter?) K* leak channel glucose transporter bacteriorhodopsin Na-K pump glucose-Na symport Na-H exchanger Performs active or passive transport? Energy source for movement of solute(s) or ion(s) Direction of movement of solute(s) or ion(s) with respect to the electrochemical gradient Na K* Na glucose Na H' Direction of movement of solute(s) or ion(s) with respect to the membrane crossed Na K₁ Na' glucose Na H' Is the protein a uniport, symport, antiport, or none of the above?Crossing a cell membrane by simple diffusion can be distinguished from facilitated diffusion by which of the following: Select all that apply. Simple diffusion moves molecules down a concentration gradient while facilitated diffusion moves molecules up a concentration gradient Simple diffusion does not require membrane proteins; facilitated diffusion requires specific membrane proteins Simple diffusion does not require energy; facilitated diffusion requires energy Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturatedHow is active transport different from simple diffusion? Both active transport and simple diffusion transport molecules against the concentration gradient. In active transport, molecules are moved down the concentration gradient; on the B contrary, molecules to be transported in simple diffusion are moved against the concentration gradient. In active transport, molecules are transported with the aid of transport proteins; on the © other hand, molecules to be transported in simple diffusion do not need transport proteins. In active transport, molecules that are transported does not need metabolic energy; in contrast, molecules transported in simple diffusion need metabolic energy.