Which statement about active ion transporters is true? O They move certain ions against the concentration gradient. O They move all ions against the concentration gradient. O They are selectively permeable to certain ions. O They are functionally similar to ion channels. O They allow ion movement down the concentration gradient.

Which statement about active ion transporters is true? O They move certain ions against the concentration gradient. O They move all ions against the concentration gradient. O They are selectively permeable to certain ions. O They are functionally similar to ion channels. O They allow ion movement down the concentration gradient.

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.
Ions like K+ cannot diffuse directly across the membrane. They need open ion channels to cross the membrane. Explain why.
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
List two ways that channels differ from transporters? What type of molecules do channels usually transport?
"Transporters saturate at high concentrations of the transported molecule when all their binding sites are occupied; channels, on the other hand, do not bind the ions they transport and thus the flux of ions through a channel does not saturate." is true or false.
The determination of membrane permeability to a specific solute is broadly Fick's first law that is modified to account for... the size of the solute relative to the membrane lipids the solute's ability to dissolve in lipids membrane thickness the electrical interaction between the solute and the membrane
A single type of ion may pass through several different typesof channels. Explain the term with an example?
The figure below shows the movement of a particular ion across a cellular membrane. + + + + + + + + + + + + + + + + +
Make some generic comments about channel structure and activity. Why does solute passextremely fast but intermittently? Why are some channels extremely specific while others aremuch more general? What part of the channel structure determines what passes and when it isclose/open?
What would the membrane potential be if the cell membrane suddenly became 10X more permeable to just sodium?
In which way are voltage-gated ion channels and active transporters similar? a they are required to move small permeable molecules across cell membranes b they are proteins which move molecules across cell membranes c they utilize facilitated diffusion d they directly require energy in the form of ATP to move molecules e they generate concentration gradients