Transportation by transporters and channels are similar in that they both can occur with passive transport but yet one (transport by transporters) sometimes requires energy in order to happen, does the use of energy provide something special to the cell?

Transportation by transporters and channels are similar in that they both can occur with passive transport but yet one (transport by transporters) sometimes requires energy in order to happen, does the use of energy provide something special to the cell?

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 1TAHL: Which of the following methods of transport is being used to transfer the substance into the cell in...

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

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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
The following are true statements regarding passive facilitated transport EXCEPT The process is always thermodynamically favorable. It uses the same driving force as that of active transport. The movement of solute acrosss the membrane is dictated by existing concentration or ion gradient. It requires a carrier protein which is an integral membrane protein.
Distinguish between simple diffusion (SD), facilitated diffusion (FD), and active transport (AT) across a membrane for the following questions. (a) Which processes are energy dependent? (b) Which processes need some kind of carrier protein(s)? (c) Which processes can be saturated by substrate? (d) Which processes can establish a concentration gradient? (e) How much energy does it take to transport an uncharged substrate in, if its starting inside concentration is 10-fold greater than outside?
Here's one experimental approach to finding out how rapidly a membrane transporter can move its solute into the cell: combine biochemical information about how much solute accumulates in the cell over time with structural information about how many transporters are on the surface of the cell. You are studying a spherical eukaryotic cell that has a diameter of 20 um and is engaged in glycolysis. Its energy source is glucose, which it is taking up from its environment via Na/glucose symporters distributed throughout the surface of its plasma membrane. By briefly adding an inhibitor of all glucose breakdown, you are able to determine that glucose accumulates in the cell at the rate of (5.000x10^1) µM/hr. Based on this number, how many umoles of glucose must be entering the cell per hour? (Assume that one-half of the volume of the cell is composed of organelles, and thus not available for diffusion of glucose). Put your final answer in umol/hr.
1) You are studying a transport protein. It appears to bind temporarily to the molecule to be transported. During normal transport, no energy is expended. The addition of a particular molecule that closely resembles the normally transported molecule inhibits transport. An increase in the concentration of the normally transported molecule in the presence of a constant concentration of the inhibitor increases the rate of transport. What kind of transport is described? 2) What are peripheral membrane proteins?
Compare and contrast the following methods of a passing cell membrane in terms of movement with respect to the concentration gradient, use of ATP, and the use of transporters with examples. Active Transport vs Passive Transport
Uniporters and ion channels support facilitated transport across cellular membranes. Although both are examples of facilitated transport, the rates of ion movement via an ion channel are roughly 104- to 105-fold faster than the rates of molecule movement via a uniporter. What key mechanistic difference results in this large difference in transport rate? What contribution to free energy (ΔG) determines the direction of transport?
A B ATP Identify the types of transport happening in the pictures above. Compare and contrast these 2 types of transport. Include information such as direction of movements, energy usage, and types of materials transported. Claim: Identify the type of transport happening in both pictures A and B. Be specific - If it is passive transport, what kind (diffusion, osmosis, or facilitated diffusion)? If it is active transport, what kind (endocytosis, exocytosis, or membrane pump)?
The transport of a certain molecule exhibits the following characteristics: (1) The molecule moves down its concentration gradient; (2) at concentrations above a given level, there is no increase in the rate of transport; and (3) cellular energy is not required for transport to occur. Which type of transport process is at work?
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
Endocytosis and exocytosis are both forms of [ ACTIVE / PASSIVE ] transport that [ DO / DO NOT ] require energy. Outline an example/scenario in which a cell would need to perform a form of endocytosis. Outline an example/scenario in which a cell would need to perform exocytosis. a) Name the 3 specific types of endocytosis. b) Exocytosis is considered the opposite/reverse process as? Pls help
Compare and contrast the following methods of a passing cell membrane in terms of movement with respect to the concentration gradient, use of ATP, and the use of transporters with examples. (Simple) Diffusion Facilitated Diffusion/Passive Transport Osmosis Active Transport Exocytosis Endocytosis (with its 3 subforms)