The animated figure shows a passive transporter transporting solute across the membrane. The GLUT2 transporter is a passive glucose transporter found on the plasma membrane in liver cells. When blood glucose levels are high after a meal, glucose is transported by GLUT2 into liver cells for storage. When blood glucose levels are low, glucose can be transported out of the liver using the same GLUT2 transporter. How can the same transporter transport glucose in one direction in some conditions and in the opposite direction in other conditions? Choose one: A. The GLUT2 transporter transports glucose with the concentration gradient so it will transport it both into and out of the cell in the direction of the gradient. B. The GLUT2 transporter forms a pore across the membrane for glucose to flow through. C. The GLUT2 transporter imports glucose into the cell in a passive manner and uses the energy of ATP to export glucose. D. The liver cell can flip the GLUT2 transporter so glucose is transported the opposite way when needed.
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Step 1: The GLUT2 transporter is a passive transporter, meaning it does not require energy (such as ATP) to transport glucose across the membrane. Show more…
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30. Which statement describes the mode of action of the ABCB1 transporter (the first eukaryotic ABC transporter to be recognized)? a. During transport, the ligand binding site is alternately exposed to the exoplasmic and the cytoplasmic side of the membrane. b. During transport, a conserved aspartate residue is phosphorylated. c. This class of pumps transports only H+ ions. d. This transporter acts as a chloride channel. 31. The resting membrane potential in animal cells depends largely on nongated ______ channels. a. Ca2+ b. H+ c. K+ d. Na+ 32. Parietal cells acidify the stomach contents while maintaining a neutral cytosolic pH by: a. exporting "excess" cytosolic OH- as HCO3-. b. exchanging HCO3- for Cl-. c. preserving electroneutrality by accompanying the movement of each Cl- ion into the stomach lumen by a K+. d. all of the above. 33. Which of the following would increase the rate of glucose uptake in cultured liver cells? a. Transfect cells with the wild-type GLUT-1 gene. b. Increase the concentration of glucose in the medium. c. Decrease the concentration of calcium in the medium. d. Decrease the concentration of glucose in the medium. e. Both A and B 34. Which of the following statements regarding transcellular transport is NOT true? a. Tight junctions are specialized regions of the plasma membrane that mediate separation of the apical and basolateral membranes. b. The movement of glucose into the blood is mediated by GLUT2 transporters. c. The Na+ concentration gradient across the membrane is the only gradient required to drive uptake of glucose from the intestine. d. Transcellular transport moves glucose across epithelia asymmetrically
Madhur L.
The glucose transporter (GLUT) is a uniporter that moves one molecule of glucose down its concentration gradient. What method of transport does this represent? OA. Facilitated transport OB. Secondary active transport OC. Primary active transport OD. Simple diffusion OE. Endocytosis For a protein targeting the ER lumen, which of the following steps would happen second? OA. The bound SRP chaperones the protein to an SRP receptor on the ER. OB. Translocon opens. OC. An SRP recognizes the signal sequence on the N terminus of the protein. OD. Translation begins in the cytosol by cytosolic ribosomes. If the GLUT-4 transporter is halfway to its saturation point, at what rate is it transporting glucose across the plasma membrane? O A. The GLUT-4 transporter does not transport glucose, so the rate would be 0 OB. It is transporting glucose at its maximal rate, known as the Vmax OC. It is transporting glucose at half of its Km OD. It is transporting glucose at half its maximal rate, known as Km
Adi S.
This question is about transport across membranes. Glucose is transported with sodium ions into the proximal convoluted tubule in the kidney via a symporter, which is a type of cotransporter. An example of secondary active transport is the movement described above. Distinguish between primary and secondary active transport. Another well-known cotransporter involving sodium ions is an antiporter that works with another ion. Another well-known cotransporter involving primary active transport is shown in Figure 1. The symporter uses secondary active transport. Glucose is then transported into the blood capillaries via GLUT2 transporters along its concentration gradient. Points X and Y are two points in the kidney. The water potential at point X was found to be -450 MPa, whereas that at point Y was found to be -300 MPa. Fill in the blanks of the following statement: Water travels from point ____ to point ____ by osmosis.
Suman K.
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