Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 5, Problem 6TY
Summary Introduction
Introduction: There are various transport processes used for the conduction of ions and molecules across the membrane. Carrier proteins and channel proteins do the basic transports of ions. The sodium ion is one of the most important ions for various processes. The bulk transport of these ions is also carried out by several sodium pumps located on the cell.
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The major function of the sodium-potassium pump is toa. pump Na+ into and K+ out of the cell.b. generate the resting membrane potential.c. maintain the concentration gradients of Na+ and K+ across theplasma membrane.d. oppose any tendency of the cell to undergo hyperpolarization.
The resting membrane potential of a cell is the consequence of which of the
following concentrations of ions?
A. High K* and Cl- outside the cell and high Na* and large anions inside the
cell.
B. High K* and Na* outside the cell and high Cl- and large anions inside the
cell.
C. High Cl- and Nat outside the cell and high K* and large cations inside the
cell.
D. High Ca2+ and Nat outside the cell and high K* and large cations inside the
cell.
One of the following is TRUE?
A. The transport of Na+ across cell membranes depends solely on concentration gradient
B. The transport of sucrose across cell membranes depends solely on concentration gradient
C. The transport of K+ across cell membranes depends solely on concentration gradient
D. The transport of Ca2+ across cell membranes depends solely on concentration gradient
E. A & C
Chapter 5 Solutions
Biology
Ch. 5.1 - Core Skill: Modeling The goal of this modeling...Ch. 5.2 - Prob. 1CSCh. 5.3 - Prob. 1CCCh. 5.3 - Prob. 2CCCh. 5.4 - Prob. 1CSCh. 5.4 - Prob. 2CSCh. 5.4 - Lets suppose the inside of a cell has a solute...Ch. 5.5 - What is the purpose of gating?Ch. 5.5 - Prob. 1EQCh. 5.5 - Prob. 2EQ
Ch. 5.5 - Prob. 3EQCh. 5.6 - What is the function of the protein coat?Ch. 5 - Prob. 1TYCh. 5 - Which of the following events can never be...Ch. 5 - Lets suppose an insect, which doesnt maintain a...Ch. 5 - Prob. 4TYCh. 5 - Prob. 5TYCh. 5 - Prob. 6TYCh. 5 - Prob. 7TYCh. 5 - Prob. 8TYCh. 5 - Prob. 9TYCh. 5 - Large particles or large volumes of fluid can be...Ch. 5 - With your textbook closed, draw and describe the...Ch. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 1COQCh. 5 - With regard to bringing solutes into the cell...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of these statements about ion movement through the plasmamembrane is true?a. Movement of Na+ out of the cell requires energy (ATP).b. When Ca2+binds to proteins in ion channels, the diffusion of Na+into the cell is inhibited.c. Specific ion channels regulate the diffusion of Na+ through theplasma membrane.d. All of these are truearrow_forwardMolecule X binds to a receptor that works as an ion channel. Which of the following must betrue of this receptor?A. It allows passage of only one type of ion.B. It is found in the cytosol of the cell.C. It is voltage dependent.D. It is slow to produce a response in the cell.arrow_forwardThe cell membrane has ion channels that can exist in two states, open or closed. When they are open, they let Na+ ions through. The energy of the open state is 4*10^-20 J. higher than the state of the closed channel. a. What proportion of the ion channels are open at a temperature of 20 C? b. How high should the temperature be so that 75% of the channels are open?arrow_forward
- Which of the following statements concerning ionophoresare true?a. Ionophores form channels through which ions flow.b. They require energy.c. Ions may diffuse in either direction.d. Ionophores may cause voltage gates.e. They transport all ions with equal ease.arrow_forwardWhich of the following best describes a hyperosmotic solution? A. a solution with a higher concentration of solutes as compared to the other side of the membrane B. a solution with a lower concentration of solute as compared to the other side of the membrane C. a solution with equal solute concentration as compared to the other side of the membrane D. none of the abovearrow_forwardThe figure at right illustrates the relationship between body fluid osmotic concentration and environment osmotic concentration for several aquatic animals. In seawater (ambient osmotic pressure = 1000 mOsm), the shrimp is best described as... A. A hypo-ionic regulator B. A hyperosmotic conformer C. A hypo-osmotic regulator D. A euryhaline conformer E. None of the above Blood osmotic pressure (mOsm) 1500 1000 500 0 0 Green crab Mussel Shrimp 500 1000 Ambient osmotic pressure (mOsm) 1500arrow_forward
- The sodium–potassium pumpa. helps establish an electrochemical gradient across the membrane.b. concentrates sodium on the outside of the membrane.c. uses a carrier protein and chemical energy.d. is present in the plasma membrane.e. All of these are correct.arrow_forwardWhich of the following statements about "leak channels" in the plasma mem- brane is correct? A. Proteins that form these channels bind to solutes to allow them to pass into the cell. B. They are passageways formed by proteins to allow water and ions to move passively through the membrane. C. They allow small ions and molecules to move between adjacent cells. D. They are formed by glycoprotein and proteoglycans to allow hormones to enter cells.arrow_forwardThe Na/K pump in epithelium cells that line the gut is an example of ______ transport and helps __ Select one: a. active, prevent the movement of Cl- outside the cell b. active, prevent the movement of Cl- inside the cell c. active, prevent the movement of Na+ outside the cell d. passive, prevent the movement of Cl- outside the cell e. passive, prevent the movement of Cl- inside the cellarrow_forward
- A cell membrane's resting potential (about -70mV inside with respect to the outside) is due mainly to which of the following mechanism? A. The sodium potassium pump b. The diffusion of cations and anions through the membrane along their concentration gradients c. The diffusion of sodium and potassium across the cell membrane d. The presence inside the cell of anions too large to passively cross the cell membranearrow_forwardABC transporters are: a. An example of active transport with activity in multi-drug resistance. b. An example of passive-mediated transport with activity in multi-drug resistance. c. An example of an ion channel that binds ATP for effective transport. d. An example of a pump involved in Ca2+ transport. e. An example of an antiporter.arrow_forwardGABA receptors play an essential role in neurotransmission in the central nervous system. In response to the appropriate signal, these receptors open up and allow CI (chloride ions) to flow into the cell. Given this information, GABA receptors can be classified as a A. gated ion channel B. carrier protein O C. symporter D. enzymearrow_forward
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