Active transport across membrane can be mediated by the following mechanisms: “Uphill” transport is powered by energy from photons. A solute is driven “uphill” compensated by a different solute being transported “downhill.” “Uphill” transport is powered by ATP hydrolysis. All of the above. None of the above.
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Active transport across membrane can be mediated by the following mechanisms:
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“Uphill” transport is powered by energy from photons. |
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A solute is driven “uphill” compensated by a different solute being transported “downhill.” |
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“Uphill” transport is powered by ATP hydrolysis. |
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All of the above. |
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None of the above. |
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- Passive transport across the membrane mediated by a carrier— would not be saturated by increasing amount of substance to be transported. does not require energy (ATP). can be driven in reverse. moves the solute through the membrane in the “uphill” direction of their concentration gradient. is faster than transport mediated by channel proteins.Which of the following characteristics may be used to describe Active Transport? Select all that apply. occurs without a transporter protein requires an energy source shows saturation kinetics (has a maximum rate) can occur against a concentration gradient (i.e. uphill)Time Which of the following is not true about Active transport Select one: O is not driven by the concentration gradient in the cell. O can increase the concentration of an ion in the cell more than the surrounding medium. O is driven by ATP and PME O requires the help of channel proteins. occurs with the assistance of membrane proteins. N
- One of the following Is not a characteristic of the second Active transport: a- Using the hydrolysis of ATP directly. b- No need for carrier protein C- The movement of substance is with its concentration. d- All of the aboveWhen 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 transportactive transport when no ATP is available is faster than when ATP is available true or false?
- Which of the following membrane transport mechanisms requires expenditure of metabolic energy? active transport of water facilitated transport of valine coordinated transport of Na+ and K+ against concentration gradient. diffusion of steroidsThe comparison of the simple diffusion, facilitated diffusion and active transport are shown in the table below: * Which comparisons are TRUE? Simple Diffusion Facilitated Diffusion Active Transport I Require ATP Does not require ATP Require ATP II Does not involve a Involve a transport Involve a transport transport protein protein protein From a region of higher III From a region of higher concentrațion of substance to a region of lower concentration of From a region of lower concentration of concentration of substance to a region of lower concentration of substance. substance to a region of higher concentration of substance. substance. O I and II only I and III only O Il and III only O I, Il and IIIWhich is not required for passive transport across a membrane (select all that apply and explain why): a concentration gradient a cotransported ion energy a protein channel
- Which is the complete description of active transport? The movement of molecules from an area of higher concentration to an area of lower A concentration across a selectively permeable membrane which uses metabolic energy from ATP. The movement of molecules from an area of higher concentration to an area of lower B concentration across a selectively permeable membrane which does not use metabolic energy from ATP. The movement of molecules from an area of lower concentration to an area of higher C concentration across a selectively permeable membrane which uses metabolic energy from ATP and transport proteins. The movement of molecules from an area of lower concentration to an area of higher D concentration across a selectively permeable membrane which does not use metabolic energy from ATP and transport proteins.In Chapters 11 & 12, the following examples of membrane transport proteins are given. Fill out the table with the correct answer for that particular transport protein. Type of transport protein (channel or carrier/transporter?) K* leak channel glucose transporter bacteriorhodopsin Na-K pump glucose-Na symport Na-H exchanger Performs active or passive transport? Energy source for movement of solute(s) or ion(s) Direction of movement of solute(s) or ion(s) with respect to the electrochemical gradient Na K* Na glucose Na H' Direction of movement of solute(s) or ion(s) with respect to the membrane crossed Na K₁ Na' glucose Na H' Is the protein a uniport, symport, antiport, or none of the above?In primary/direct active transport, does ATP always have to be involved? Definitions seem to say the movement must be coupled with an exergonic reaction. Wouldn't the movement of a solute down its concentration gradient be exergonic, or is this an incorrect statement?