only in cell biology...... Which ones of the following are examples of passive transporters? i. Na+-K+ pump ii. Glucose Transporter iii. Ca++ Pump iv. Na+ Channel v. H+ Pump
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only in cell biology......
Which ones of the following are examples of passive transporters?
i. Na+-K+ pump
ii. Glucose Transporter
iii. Ca++ Pump
iv. Na+ Channel
v. H+ Pump
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- The parasite Trypanosoma brucei, which causes sleeping sickness, uses proline as an energy source during one stage of its life cycle. The properties of this proline-specific transporter were investigated in a series of experiments. L-hydroxyproline inhibited the transporter. D-proline did not inhibit the transporter. Na*, K*, and pH changes did not affect the transporter. Which of the following is a reasonable hypothesis based on this data? The proline transporter is a Na+-K+ ion pump. The proline transporter cleaves amide bonds. The proline transporter is stereospecific. The proline transporter requires metal-ion catalysis. The proline transporter has an essential ionizable histidine residue,Can't see this image? Please see this file:Online Module 2A Q5.pdf Consider the scenario depicted below: A Transporter A Transporter B Transporter C B Transporter D C D Electrochemical gradient: high high low Which transporter (D or E) represents how the Na+/Glucose transporter allows for glucose uptake into intestinal cells? Note that the outside and inside of the cell are not labeled. II low low high1. Name the two forms of passive transport. 2. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is. 3. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.
- Match the transport mechanisms with their descriptions. (1) diffusion (2) facilitated diffusion (3) filtration (4) active transport (5) endocytosis (6) exocytosis A. the cell membrane engulfs a particle or substance, drawing it into the cell in a vesicleB. movement down the concentration gradient with a carrier protein, without energy inputC. movement down the concentration gradient without a carrier protein or energy inputD. a particle or substance leaves a cell in a vesicle that merges with the cell membraneE. movement against the concentration gradient with energy inputF. hydrostatic pressure forces substances through membranessecondary active transport depends on which of the following principals a. sodium is pumped pout of the cells against a concentration gradient by [primary active transport b. sodium moves out the cells with a concentration gradient c. primary active transport is necessary to pump sodium into the cell from higher to lower concentration d. diffusion causes sodium to move our of the cell23.Summarize the steps that occur to set up secondary transport (co-transport) and during co-transport. Practice by drawing in circled numbers in the images below to match the steps I have summarized below. [Gluc [Na] low Na high Na ATP 1. Three Na' ions inside the cell move OUT of the cell, across the Na*K* pump, from a low to a high concentration (AGAINST their concentration gradient). This requires the energy of ATP. This sets up the concentration gradient needed in the next step (the next step requires a low Nation concentration INSIDE the cell) 2. Nations in the interstitial fluid = extracellular fluid (fluid surrounding the cell) move INTO the cell, across a co-transport protein. The ions move from a high to a low concentration (DOWN their concentration gradient). This RELEASES energy. This energy is used in the next step. 3. Glucose in the interstitial fluid moves INTO the cell, across a co-transport protein, from a low to a high concentration (AGAINST their concentration…
- We discussed 3 "directions of movement" categories a transporter can move a molecule (symport, antiport, uniport). Choose TWO directions and 1. provide an example of a transporter or channel type, and 2. describe the direction of movement of a molecule, O doocribe the energy source for the movement of these moleculesHow 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.K+ [Select] [Select] A Na+ Primary active transport is being shown by transporter [Select] which uses [Select] ATP [Select] B The transported molecules in this mechanism are being moved [Select] to move Glucose active transport is being shown by transporter [Select] which uses the gradient. Secondary to move against the gradient. When both the molecules move through a transporter in the same direction as in B, this type of transport is called antiport.
- 1. Examine each one and discuss it's function in a cell membrane. Determine if you think each one is involved in passive or active transport, and if it is active determine the most likely source of energy. Protein Name Active or passive? Energy source? K+ high K+ low Potassium Channel ATP H+ high H+ low Proton Pump Na+ high Na+ low ATP K+ low K+ high Na+ - K+ Pump Proline Low Na+ high Proline high Na+ - Proline Cotransporter Na+ Low H+ high H+ low Sucrose low Sucrose high H+ - Sucrose CotransporterName the three classes of membrane transport proteins. Explain which one or ones of these classes is able to move glucose and which can move bicarbonate (HCO3−) against an electrochemical gradient. In the case of bicarbonate, but not glucose, the ΔG of the transport process has two terms. What are these two terms, and why does the second not apply to glucose? Why are cotransporters often referred to as examples of secondary active transport?Name the three classes of membrane transport proteins. Explain which one or ones of these classes is able to move glucose and which can move bicarbonate (HCO3 −) against an electrochemical gradient. In the case of bicarbonate, but not glucose, the ΔG of the transport process has two terms.What are these two terms, and why does the second not apply to glucose? Why are cotransporters often referred to as examples of secondary active transport?