In facilitated diffusion, what is the role of the transport protein? > View Available Hint(s) O Transport proteins allow solutes to move passively down their concentration gradient across the membrane. O Transport proteins provide the energy for diffusion of the solute. O Transport proteins provide a low-resistance channel for water molecules to cross the membrane. O Transport proteins provide a protein site for ATP hydrolysis, which facilitates the movement of a solute across a membrane. Transport proteins organize the phospholipids to allow the solute to cross the membrane.

In facilitated diffusion, what is the role of the transport protein? > View Available Hint(s) O Transport proteins allow solutes to move passively down their concentration gradient across the membrane. O Transport proteins provide the energy for diffusion of the solute. O Transport proteins provide a low-resistance channel for water molecules to cross the membrane. O Transport proteins provide a protein site for ATP hydrolysis, which facilitates the movement of a solute across a membrane. Transport proteins organize the phospholipids to allow the solute to cross the membrane.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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How 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.
The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient (this is a hydrogen ion H+ gradient), established via breakdown of ATP for energy, across the membrane-more acidic outside the cell than inside the cell. Phosphate transport may best described as an example of F Ocotransport or secondary active transport O facilitated diffusion O active transport O passive diffusion O osmosis
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
For each of the following scenarios described where a molecule or ion is moving from one side of a membrane to the other, select the method by which the molecule or ion is moving. Each answer can be used more than once, or not at all. - Simple Diffusion - Facilitated diffusion by a channel protein - Facilitated diffusion by a carrier/transport protein - Active transport by a pump - Could be facilitated diffusion by a channel or a carrier; not enough information is given A- While water can freely diffuse across the membrane, it does not do so fast enough for living organisms to function properly. Therefore, membrane proteins known as aquaporins can increase the rate at which water moves across the membrane. The movement of water across the membrane via aquaporins (which do not change shape) is an example of which type of transport? B-Many snake venoms induce paralysis by acting on acetylcholine receptors. Nicotinic acetylcholine receptors are transmembrane proteins that allow Na+, K+…
The 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 III
rate of transport Vmax 1/2Vmax transporter-mecated diffusion Km simple diffusion concentration of transported molecule The graph at left shows rates of movement across a cell membrane for a substance that uses simple diffusion (green) and a transport mechanism (red). Which of the following is TRUE about the transporters at the point shown by the arrow? A. The transporter proteins are operating more slowly than at lower concentrations. B. The transporter proteins are operating as fast as possible. C. The transporters proteins shut off at that concentration. D. The rate slows because transporter proteins run out of ATP.
In facilitated diffusion and active transport, how do transport proteins affect the rate of movement of molecules across the phospholipid selectively permeable membrane? A Transport proteins decrease the rate of movement of molecules. B Transport proteins stop the rate of movement of molecules. © Transport proteins increase the rate of movement of molecules. Transport proteins ensures all molecules may pass the membrane simultaneously.
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?
Which of the following statements is correct about passive facilitated diffusion? (select all that apply) V It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). O It requires a transport protein. O It requires an expenditure of energy by the cell. O It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). O It involves movement of molecules up a concentration gradient and requires a transport protein.
across th Bay pıduoudsoud Diffusion Facilitated Diffusion Active Transport Flows against the concentration gradient (low to high) (high to Flows along the concentration gradient (high to low) Requires energy for particles to crss Requires membrane proteins for assistance
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
Which of the following is FALSE regarding membrane transport? O A cell can add proteins into its membrane through the process of exocytosis O lons like Na+ or K+ do not enter a cell via simple diffusion O Hydrophobic molecules usually enter a cell via protein channels O lon channels must be integral proteins