Part III: This diagram should look familiar from your notes. It is a model of complex ion-gradient dependent active transport. In your OWN words, explain what is happening in this figure. Be sure to include how the glucose transporter is dependent on the Na/K pump and why this is active transport. What are antiporters and symporters? Also explain how this process is dependent on a steady supply of ATP. This Na+/K+ antiporter pump uses direct active transport to create both an Na+ and a K+ gradient by cleaving ATP. This Na+/glucose symporter uses indirect active transport to build a glucose gradient by expending an Na+ gradient. Extracellular space Na+ K+ Na+ Glucose K+ channel ATP ADP K+ Cytosol
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The diagram shows a model of complex ion-gradient dependent active transport. This means that the transport of molecules across the cell membrane is dependent on the concentration gradients of ions, specifically sodium (Na+) and potassium (K+). Show more…
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The following diagram shows three transport membrane proteins found on the membrane of cells in the kidneys: SGLT2, GLUT2 and Na/K ATP Pump. SGLT2 is a co-transporter, which transports 1 glucose into the cell using the sodium gradient established by Na/K ATP Pump. GLUT2 is a passive transport protein. Based on the diagram below, SGLT2 uses which of the following transport mechanism? Passive diffusion Facilitated diffusion Primary Active Transport Secondary Active Transport
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The diagram in Figure $12-9$ shows a transporter that mediates the passive transfer of a solute down its concentration gradient across the membrane. How would you need to change the diagram to convert the transporter into a pump that moves the solute up its concentration gradient by hydrolyzing ATP? Explain the need for each of the steps in your new illustration.
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
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