Campbell Biology In Focus
2nd Edition
ISBN: 9780134203072
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Question
Chapter 5.4, Problem 2CC
Summary Introduction
To explain:
Why the sodium-potassium pump would not be considered a co-transporter.
Concept introduction:
Co-transport is a process in which one solute is transported down its concentration gradient coupled with the transport of another solute against its concentration gradient. This process is mediated by transport proteins present in the cell membrane called co-transporter.
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Students have asked these similar questions
Palytoxin is a deadly compound found in certain marine
animals. When scientists first isolated palytoxin from sea
corals in the 1970s, they did not know how it affected
people exposed to it. In time, they began to suspect that
the toxin was interfering with the sodium-potassium pump.
Researchers have measured the effect of palytoxin on ion
transport through the sodium-potassium pump using the
patch-clamp technique. This involves using a fine-tipped
microelectrode to measure the electric current across pumps
in the cell membrane. In this activity, you will examine some
of the researchers' results and conclusions.
Procedure
1. Read the following observations that researchers made
after adding palytoxin to a membrane, and then answer
the questions.
• Observation 1: The current across a single pump
jumped from 0 picoamperes to 1 picoamperes.
• Observation 2: When ATP was added to the
cytoplasm-facing side of the membrane, the current
across a group of pumps increased by a factor of 8…
Describe the structure and function of pumps
Why is it important to determine percent change in mass in regards of an Osmosis Experiment ?
Chapter 5 Solutions
Campbell Biology In Focus
Ch. 5.1 - Plasma membrane proteins have carbohydrates...Ch. 5.1 - WHAT IF? How would the membrane lipid composition...Ch. 5.2 - What property allows O2 and CO2, to cross a lipid...Ch. 5.2 - Why is a transport protein needed to move many...Ch. 5.2 - MAKE CONNECTIONS Aquaporins exclude passage of...Ch. 5.3 - How do you think a cell performing cellular...Ch. 5.3 - WHAT IF? If a Paramecium caudatum cell swims from...Ch. 5.4 - Sodium-potassium pumps help nerve cells establish...Ch. 5.4 - Prob. 2CCCh. 5.4 - MAKE CONNECTIONS Review the characteristics of the...
Ch. 5.5 - As a cell grows, its plasma membrane expands. Does...Ch. 5.5 - Prob. 2CCCh. 5.5 - MAKE CONNECTIONS In Concept 4.7, you learned that...Ch. 5.6 - During an epinephrine-initiated signal in liver...Ch. 5.6 - When a signal transduction pathway involves a...Ch. 5.6 - WHAT IF? How can a target cells response to a...Ch. 5 - In what way do the membranes of a eukaryotic cell...Ch. 5 - Which of the following factors would tend to...Ch. 5 - Phosphorylation cascades involving a series of...Ch. 5 - Lipid-soluble signaling molecules, such as...Ch. 5 - Which of the following processes includes all the...Ch. 5 - Based on Figure 5.17.which of these experimental...Ch. 5 - Prob. 7TYUCh. 5 - SCIENCE, TECHNOLOGY, AND SOCIETY Extensive...Ch. 5 - FOCUS ON EVOLUTION Paramecium and other...Ch. 5 - FOCUS ON INTERACTIONS A human pancreatic cell...Ch. 5 - SYNTHESIZE YOUR KNOWLEDGE In the supermarket,...
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- Whereas electrical currents are carried by electrons in copper wire,they are carried by ions in aqueous solutions. Explain how anactive-transport mechanism can create an electrical current acrossa membrane.arrow_forwardATP is not directly involved in the functioning of a cotransporter. Why,then, is cotransport considered active transport?arrow_forwardDescribe the mechanism by which a transporter of a mediatedtransport system moves a solute from one side of a membrane to the other.arrow_forward
- Explain why the negative charges embedded within the filtration membranes are able to repel proteins which are negative charge but not chloride ion.arrow_forwardthe sodium channel exchanger NCX transports sodium into and calcium out of cardiac muscle cells. Describe why this itransporter is classified as secondary active transport?arrow_forwardIf the activity of the Na+/HCO3− symporter were increased, how would blood pH change? Why?arrow_forward
- Reverse osmosis uses extreme pressure to force water through many layers of selectively permeable membranes. This traps the salt and other dissolved solutes on one side of the membrane, while pure water builds up on the other side. explain why this process is called "reverse osmosis" and describe at least one positive or negative impact of using this technology to desalinate water.arrow_forwardGive an example of a secondary active transport event that results from the primary active transportation of Na+ and K+ by the sodium-potassium antiport pump.arrow_forwardIn an investigation of osmosis, apple cores were submerged in different molarity solutions to determine the unknown osmolarity of the apple. To determine the molarity five uniform apple cores were massed before submerging them in different molarity solutions. After 24 hours the apple cores were massed again. Then the percent change in mass was determined for the five uniform apple cores in each molarity solution. (b) Identify the osmolarity of the apple.arrow_forward
- explain why the negative charges embedded within the filtration membrane are able to repel protein which are negative charge but not chlorine ironarrow_forwardThe mixing of liquids is critical in microfluidic analytical systems and is often taking place in Y-shaped junctions as seen in Figure Q4b. The inlets are 50 μm wide and 50 µm high, and the outlet is 50 μm wide and 50 μm high. The aim of the device is to analyse IgG with a diffusion coefficient of 4-10 cm²-s¹. Determine the shortest length of the channel to ensure complete mixing when the flowrate in each of the inlet channels is 1 µl/h. [4] Inlet 1 50 µm Inlet 2 Select one: O a. 8.65mm O b. 3.47 mm O c. 112 pm O d. 5.34 mm 50 µm Outlet Figure Q4b. Schematic of a Y-shaped microfluidic device used for mixing two fluids.arrow_forwardA beaker contains two compartments (A and B) with equal volumes of solution separated by an artificial membrane with a pore size of 24 Angstrom (Å). Explain the net movement of solute if Compartment A has 3% albumin while compartment B has 2% potato starch (albumin diameter = 38 Å; potato starch = 300,000-1000000 Å).arrow_forward
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