The pathway that can move highest rates of sodium ions is: A. Sodium channels B. Sodium pumps-ATPases C. Sodium exchangers OD. Sodium diffusion in solution
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- Which of those ions do not have specific pumps in membrane? Select one: a. K O b. H O c. CI d. NaWhich of the following is a way for electrolytes in an aqueous solution to move from an area of high solute concentration to an area of low concentration? O a. Active transport O b. Osmosis O c. Simple diffusion Od. Facilitated diffusion O e. None of theseDefine the following terms:a. osmosisb. osmotic pressurec. isotonic solutiond. membrane potentiale. hydronium ion
- Which of the following describes cotransport (secondary active transport)? Group of answer choices D. One substance moving down its gradient causes another substance to move against its gradient. The push and pull of electric charges Equilibrium of all solutes One substance moves from an area of high concentration to an area of low concentration.In considering the diffusion of ions through an ion channel, which driving force/forces must be considered?a. the ion concentration gradientb. the electrical gradientc. osmosisd. facilitated diffusione. both a and bdifference between channels and transporters is that O Only channels allow for the passage of solutes against their electrochemical gradient. OTransporters allow for a greater rate of transport across a membrane than channels do. O Only channels allow for the transport of ions. Transporters must undergo a conformational change upon binding to the solute.
- Which of the following will saturate as solute concentration increases? a. Transport of sucrose down its concentration gradient by the carrier protein GLUT2 b. Transport of chloride ions out of the endoplasmic reticulum and into the cytoplasm via a channel protein c. Engulfing of a pathogen by a white blood cell during an immune response d. All of the aboveThe following is passive transport of a solute: O a. Diffusion O b. Osmosis OC. Endocytosis Od. A and B Oe. All of the AboveSolutes tend to diffuse from a region where they ar_____ concentrated to an adjacent region where they are_______ concentrated. a. more, less c. movement is independent b. less, more of concentration
- A solution of water and dissolved ions is separated by a selectively permeable membrane that allows the passage of water but not small ions. The concentration of sodium is higher on one side of the membrane than onthe other side. However, there is no net movement of water across the membrane. How is this possible?Describe the difference between the rate of diffusion seen for sodium and urea. Select one: 1/Urea diffused faster because it is smaller than sodium. 2/Urea diffused more slowly because it is larger than sodium. 3/Urea diffused faster because it is larger than sodium. 4/Urea diffused more slowly because it is smaller than sodium.The sodium–potassium pumpa. helps establish an electrochemical gradient across the membrane.b. concentrates sodium on the outside of the membrane.c. uses a carrier protein and chemical energy.d. is present in the plasma membrane.e. All of these are correct.
