Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Question
Chapter 8, Problem 8.4PS
Summary Introduction
To explain: Two reasons that argue against the transverse carrier model based on current understanding of membrane and on
Introduction: Membrane transport is the mechanism that monitors the passage of molecules and ions across the cell membrane. The cell membrane is made up of the lipid bilayer in which the proteins are embedded. At one time, membrane biologists thought that transport protein might act by binding a solute molecule or ion on one side of the membrane and then diffusing across the membrane to release that solute molecule on the other side.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Hydrolysis .? And what is endocytosis pinocytosis phagocytosis explain with reactions or diagram.
help fill in these blanks in []
Sodium-potassium ATPases are [passive/active] transporters that move sodium and potassium [with/against] their electrochemical gradients. In other words, potassium and sodium transport, without any coupled process, are [endergonic/exergonic] processes. These transporters are [primary active/facilitated/secondary active] transporters meaning that the transport process is coupled to [ATP hydrolysis/ion diffusion] to make the process spontaneous. P-type ATPases are [acid-base/covalent/nucleophilic] catalysts that become phosphorylated during the transport cycle. The sodium-potassium ATPase moves [3/2/1] cations out of the cell for every [1/2/3] cations it moves into the cell, polarizing the membrane such that the inside is [positive/negative] compared to the outside.
Cells and Membranes
a. Give two examples of molecules that can pass through cell membranes without the need for energy, why can they do so?
Chapter 8 Solutions
Becker's World of the Cell (9th Edition)
Ch. 8 - What is the difference between the concentration...Ch. 8 - Prob. 8.2CCCh. 8 - A researcher is studying a fern that is shown to...Ch. 8 - How are carrier proteins and channel proteins...Ch. 8 - How would you determine whether a specific...Ch. 8 - Both the Na+/glucose symporter and the Na+/K+ pump...Ch. 8 - You are studying the energetics of transport of...Ch. 8 - True or False? Indicate whether each of the...Ch. 8 - Telling Them Apart. From the following list of...Ch. 8 - Mechanisms of Transport. For each of the following...
Ch. 8 - Prob. 8.4PSCh. 8 - Prob. 8.5PSCh. 8 - Prob. 8.6PSCh. 8 - QUANTITATIVE Sodium Ion Transport. A marine...Ch. 8 - Prob. 8.8PSCh. 8 - Prob. 8.9PSCh. 8 - QUANTITATIVE The Calcium Pump of the Sarcoplasmic...Ch. 8 - Inverted Vesicles. An important advance in...Ch. 8 - Ouabain Inhibition. Ouabain is a specific...
Knowledge Booster
Similar questions
- Multiple Choice. Imagine a solution containing only water, sodium, and glucose. If a voltage is applied to the solution, glucose would move: (a) There would be no net movement of glucose (b) In the opposite direction of sodium (c) In the same direction and speed as sodium (d) In the same direction as sodium, but slower. (e) In the same direction as sodium, but faster.arrow_forwardFor this practice problem, would the answer be c)NaCl? My reasoning behind this is because molecules under 100 Da can use simple diffusion, while nonpolar molecules and larger molecules like benzene can use channels via facilitated diffusion. However, NaCl dissociates into ions and cannot readily use diffusion?arrow_forwardBIOMOLECULES - MULTIPLE CHOICE - Please answer properly QUESTION : Major controls of de novo AMP synthesis include: 1. allosteric inhibition by GMP allosteric inhibition by AMP 3. availability of PRPP 4. stimulation by GTP A. 1, 2, 3, and 4 B. 1, 2, and 3 C. 2 and 4 D. 1 and 3arrow_forward
- How do proton pumps contribute to membrane potential? Please explain in 5-10 sentences only. Thanksarrow_forwardPredicting how variation in membrane lipid composition will affect the fluidity and mobility of integral membrane proteinsarrow_forwardGive 4 similarities and 4 differences between and nature and/or role of membrane potentials in a neuron and in a mitochondrion.arrow_forward
- Understanding membranes: a) Describe the factors that influence fatty acid melting temperatures and how these are taken advantage of by many organisms to modulate membrane fluidity. Why would an organism have the need to regulate membrane fluidity? b) Explain the difference between a symporter and an antiporter and discuss the energetics of transport/movement in each casearrow_forwardUniporters 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?arrow_forwardAcetic acid (a weak acid with a pKa of 4.75) and ethanol (an alcohol) are each composed of two carbons, hydrogen, and oxygen, and both enter cells by passive diffusion. At pH 7, one is much more able to permeate a cellular membrane than the other. Which is more membrane permeable, and why? Predict how the membrane permeability of each is altered when the extracellular pH is reduced to 1.0, a value typical of the stomach.arrow_forward
- BIOMOLECULES - Please answer the questions properly. - Multiple choice Allopurinol is an inhibitor of xanthine oxidase. Administration of allopurinol to a patient with gout and normal HG-PRT levels would be expected to lead to all of the following EXCEPT: A. decreased de novo synthesis of IMP B. increased xanthine in the blood C. increased levels of PRPP D. decreased urate in the urine 2. Which of the following unique attributes creates a steroid? A. 1 carboxyl group B. 4-fused carbon rings C. 2-fused oxygen molecules D. 3-fused hydrogen chainsarrow_forwardTransport kinetics through protein transporters can be described using the language of Michaelis-Menten kinetics. The transported substance binding to its protein transporter is analogous to the substrate binding to its enzyme. Thus, KM and vmax values can be determined for protein transporters. a. Use the line graph to estimate KM and vmax values for glucose uptake max by pericytes in the presence and absence of sodium ions. Show your work! b. What do these values tell you about the binding of glucose in pericytes? Specifically, have the investigators demonstrated convincingly that an SGLT exists in pericytes? In endothelial cells? Use evidence from any of the preceding questions to support your answers.arrow_forwardSuggest reason why iorganic ions such as K ,Na ,Mg ,Can do not cross biological membranes by simple diffusionarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning
Biochemistry
Biochemistry
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Cengage Learning