BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 5, Problem 4A
How are active transport and coupled transport related?
a. They both use ATP to move molecules.
b. Active transport establishes a concentration gradient, but coupled transport doesn’t.
c. Coupled transport uses the concentration gradient established by active transport.
d. Active transport moves one molecule, but coupled transport moves two.
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Students have asked these similar questions
Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process?
a. It does not require ATP
b. It is a form of active transport
c. Movement is against the concentration gradient of Na+
d. The channel probably allows many different molecules and ions to cross
How can substances be transported across a membrane against their concentration gradient?
A.
If the plasma membrane is fully hydrophobic.
B.
The plasma membrane is permeable to all small molecules.
C.
Some membrane proteins act as channels for specific molecules to enter the cell.
D.
Some membrane proteins are ATP-dependent carrier molecules.
Which observation would suggest that active transport, rather than passive diffusion, is responsible for moving a particular substance from the outside of a cell into a cell?
a. a higher concentration of the substance outside the cell than inside the cell.
b. a higher concentration of the substance inside the cell than outside the cell.
c. a positive correlation between ATP breakdown and the amount of substance taken in.
d. b and c are both correct.
Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - Prob. 1LOCh. 5.1 - Explain the fluid mosaic model of membrane...Ch. 5.2 - List the different components of phospholipids.Ch. 5.2 - Prob. 2LOCh. 5.2 - Prob. 3LOCh. 5.3 - Illustrate the functions of membrane proteins.Ch. 5.3 - Prob. 2LOCh. 5.3 - Prob. 3LOCh. 5.4 - Compare simple diffusion and facilitated...Ch. 5.4 - Prob. 2LO
Ch. 5.4 - Prob. 3LOCh. 5.5 - Prob. 1LOCh. 5.5 - Prob. 2LOCh. 5.5 - Prob. 3LOCh. 5.6 - Distinguish between endocytosis and exocytosis.Ch. 5.6 - Illustrate how endocytosis can be specific.Ch. 5 - According to the fluid mosaic model, membranes are...Ch. 5 - Prob. 2IQCh. 5 - The fluid mosaic model of the membrane describes...Ch. 5 - What chemical property characterizes the interior...Ch. 5 - The transmembrane domain of an integral membrane...Ch. 5 - The specific function of a membrane within a cell...Ch. 5 - The movement of water across a membrane is...Ch. 5 - Prob. 6UCh. 5 - Which of the following is NOT a mechanism for...Ch. 5 - A bacterial cell that can alter the composition of...Ch. 5 - What variable(s) influence(s) whether a nonpolar...Ch. 5 - Which of the following does NOT contribute to the...Ch. 5 - How are active transport and coupled transport...Ch. 5 - A cell can use the process of facilitated...Ch. 5 - figure 5.5 describes a classic experiment...Ch. 5 - Each compartment of the endomembrane system of a...Ch. 5 - The distribution of lipids in the ER membrane is...
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- The image illustrates passive and active transport across the cell membrane. (Use the diagram to answer questions A-D) A. 1. Which section represents facilitated diffusion?2. Explain why or how can you tell?3. Does the cell expend energy in this transport?4. Why or why not?5. What type of solute molecules may be moved by this type of transport? B. 1. Which section shows active transport?2. Explain why or how can you tell?3. Does the cell expend energy in this transport?4. Why or why not? C. 1. Which section shows diffusion?2. What type of solute molecules may be moved by this type of transport? D. Which of these sections are considered passive transport? Explain.arrow_forwardIf the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein? A. Since there is no concentration gradient, no transport either in or out of the cell is possible. B. The transport protein has been saturated. C. The solute must be phosphorylated with a phosphate group from ATP before further transport can occur. D. Movement of the solute across the membrane could occur and cause accumulated on one side of the membrane by an active transport protein. The concerted model of allosteric regulation is different from the sequential model, because: A. The concerted model is used to explain homotropic effects B. The sequential model is used to explain heterotropic effects C. Both A and B D. Neither A nor Barrow_forwardHow does ATP relate to membrane transport?a. The movement of a substance down its concentration gradientthrough transport proteins requires the hydrolysis of ATP.b. The higher the concentration of ATP in the cell, the more permeablethe membrane is to water and small, nonpolar molecules.d. A cell uses the energy in ATP to transport substances against theirconcentration gradient.c. Digestion produces a high concentration of ATP outside the cell,and the ATP enters the cell via facilitated diffusion.arrow_forward
- Explain the process and give an example of each form of cellular transport. a. Passive Diffusion b. Active Transport c. Facilitated Diffusionarrow_forwardWhat variable(s) influence(s) whether a nonpolar molecule can move across a membrane by passive diffusion? a. The structure of the phospholipids bilayer b. The difference in concentration of the molecule across the membrane c. The presence of transport proteins in the membrane d. All of the choices are correct.arrow_forwardCompare and contrast the following processes. Give anexample of each to illustrate.a. primary vs secondary active transportb. passive vs facilitated diffusionc. carrier-mediated vs channel-mediated transportarrow_forward
- How do small fat-soluble molecules normally get into a cell? a. they never get in b. the pass through specialized proteins in the cell membrane called aquaporins c. they bind to protein carriers d. they pass through membrane protein channels e. They dissolve in the hydrophobic components of the membrane and enter the cell by diffusionarrow_forwardWhich of these statements about carrier-mediated facilitated diffusion is true? a. It uses cellular ATP. b. It is used for cellular uptake of blood glucose. c. It is a form of active transport. d. None of these are true.arrow_forwardYou find a membrane protein that moves molecules across a membrane. What type of transport could that protein be involved in?arrow_forward
- Which properties are characteristic of ion channels?a. They are usually lipids.b. They exist on one side of the plasma membrane, usually the intracellular side.c. They can open and close depending on the presence of any of three types of “gates.”d. They permit movement of ions against electrochemical gradients.e. They mediate facilitated diffusion.arrow_forwardWhy should it not be surprising that for many cells water requires a protein for its transport across a membrane? A. There is never a concentration gradient for water across the membrane to drive its transport. B. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. C. Water is very polar which inhibits its free diffusion across the membrane. D. All molecules require transport proteins to cross a membrane. In the mitochondria phosphate ion (PO43-) and H+ are transported together from the intermembrane space into the matrix. Which statement applies? A. The interior of the transport protein must be uncharged. B. The transport protein must have a relatively large central channel to accommodate both ions. C. The transport protein is a symport. D. All of the abovearrow_forwardWhat is the name of the mechanism that ensures that there is a higher concen- tration of sodium ions in the extracellular fluid than in the intracellular fluid? A. Facilitated diffusion B. The sodium-potassium pump C. Secondary active transport D. Osmosisarrow_forward
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