Which of the following statements about ion channels are true?all ion channels are selective for only one species of ionThe only way ions can cross the membrane is through the actions of a transporter.ions can flow though the pores of ion channels faster than they can diffuse freely insolutionthe movement of ions through the pore of an ion channel does not require energy

All ion channels are selective for only one species of ion: False. While ion channels are…

Answered: Which of the following statements about…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 2TAHL: Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of...

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Describe the contribution of each of the following to establishing and maintaining membrane potential: (a) the Na+K+ pump, (b) passive movement of K+ across the membrane, (c) passive movement of Na+ across the membrane, and (d) the large intracellular anions.
difference 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 statements about ion channels is INCORRECT? Like carrier proteins, most channel proteins are specific regarding which molecules are allowed to pass. Channel proteins can have open or closed configurations. Unlike carrier proteins, some channel proteins are engaged in active transport of solutes. Channel proteins are used extensively in nerve cells, in which they are responsible for transduction of electrical signals. Compared to carrier proteins, channel proteins allow much faster transport.
Which of the following molecules can bind to and open at least one type of Kir channel? ATP PIP2 EDTA All of the above
*** fluorescence in bleached area- BLEACH WITH LASER BEAM bleach Protein 1 bleached area RECOVERY Figure 10-13 Molecular Biology of the Cell 6 (Garland Science 2015) Protein 2 *** ** *** time The diffusion/exchange rate of a protein can be measured by photobleaching techniques such as FRAP. When there is protein exchange (i.e. if the protein is mobile), fluorescence recovery in the bleached region occurs, as shown in the figure above. The graphs below show the fluorescence measurement of an area in the cell before and after bleaching for protein 1 and protein 2. Which protein has lower mobility? Protein 1 Protein 2 fluorescence in bleached area->> fluorescence in bleached area bleach BLEACH time RECOVERY time
Which of the following is important in active transport of ions in neurons? membrane channels membrane pumps membrane enzymes gated-channels
In contrast to transporters and carriers, channels: O Are selective for the specific solutes (e.g., ions) they transport Require solutes (e.g., ions) to bind to them in order to be transported O Create pores through the membrane Saturate after reaching the maximum rate of transport
When the nerves deliver a signal to contract, Ca++ (calcium ions) rush into the cell. The calcium ion influx causes specialized fibers to contract. Afterward, calcium ions are pumped out of the cell by calcium ATPases. What transport type(s) is occuring?s antiporter only ion gated transport followed by active transport active transport only ion gated transport only active transport followed by ion gated transport
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?
The figure below shows the movement of a particular ion across a cellular membrane. + + + + + + + + + + + + + + + + +
If the intracellular concentration of sodium ions in a cell is 5 mM and the extracellular concentration is 140 mM, which of the following would be TRUE? a at room temperature the equilibrium potential of sodium would be -84 mV b if the cell was only permeable to sodium its membrane potential would be negative c sodium ions would tend to move by simple diffusion into the cell d all of the above e none of the above
The reason ions such as Na+, K+, and Ca2+ diffuse across plasma membranes more rapidly than would be expected across a lipid membrane is that their negative charge causes them to dissolve in the polar lipids in the membrane ions diffuse through polar lipids more readily than non-charged particles do their positive charge causes them to dissolve in the polar lipids in the membrane there are proteins that form channels through which these ions can more readily pass

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