Which of the following does not directly or indirectly require an energy source?a. primary active transportb. operation of the Na1/K1-ATPase pumpc. the mechanism used by cells to produce a calcium ion gradient across the plasma membraned. facilitated transport of glucose across a plasma membranee. secondary active transport

Which of the following does not directly or indirectly require an energy source?a. primary active transportb. operation of the Na1/K1-ATPase pumpc. the mechanism used by cells to produce a calcium ion gradient across the plasma membraned. facilitated transport of glucose across a plasma membranee. secondary active transport

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 6RE

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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
Which of the following statement(s) about passive processes of membrane transport is false? a. cellular energy is not requiredb. substances move along its concentration gradientc. all require the aid of proteins during transportd. all of the abovee. none of the above
Which of the following statement(s) about active processes of membrane transport is false? a. cellular energy is requiredb. substances move against its concentration gradientc. all requires the aid of proteins during transportd. occurs in all cell membranese. none of the above
Which of the following describe active transport or is an example of act transport of a substance across a membrane? Choose all correct answer Glucose transport into intestinal epithelial cells Glucose transport into muscle cells Na* ion pumping out and K* ion pumping into the cell Transport requires a mediator Requires input of energy for transport Movement of ligand against the concentration gradient
Which of the following statements about passive processes of membrane transport is false? cellular energy is not required substances move along its concentration gradient all require the aid of proteins during transport a and b a and c
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
Select the correct statments regarding transport of molecules across the cell membrane. Non-mediated transport is susceptible to saturation of transporter/channel proteins. Channels and transporters need not use energy to transport solute down the concentration gradient. The Na+/K+ antiport takes advantage of electrochemical gradients to exchange Na+ and K+ ions across the cell membrane. Active transport via electrochemical gradients relies on the passive transport of one solute to transport a second solute against the concentration gradient. Describe the three main sources of membrane fluidity
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.
one reason active transport has a limited maximum transport rate at which it can progress is due to the fact that a. energy required is not available inside the cell b. carrier proteins are not on the surface of the cell membrane c. ion channels are limited in size d. the number of carrier proteins is limited and therefore they can become saturated
Glucose moves into red blood cells via facilitated diffusion using the glucose transporter. Glucose transporter, also known as GLUT, is a uniporter. How does a uniporter work? A Uniporter transports one solute at a time in the same direction. (B Uniporter transports two different solutes at the same time in the same direction. CUniporter transports two different solutes in opposite directions. D Uniporter transports two similar solutes at the same time in the same direction.
Which of the following molecules may be transported via active transport? A Large and polar molecules such as glucose and sucrose B electrically charged ions such as Na+, K+, and Ca2+ small and polar molecules such as water All of the molecules are transported via active transport E only A and B
Which of the following statements are correct? P. Plasma membrane is highly impermeable to all charged molecules Q. All membrane transport proteins so far known, are transmembrane multipass proteins R. Ionophores operate by shielding the charge of the transported ion so that it can penetrate the hydrophobic interior of the lipid bilayer. S. Na+-K+ ATPase exchanges equal numbers of Na+ and K+ ions in each pumping cycle P and Q R and S P and S Q and R