Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
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.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
A new 850 cm^2 membrane is being tested for use in a hemodialysis device. During testing, a model fluid mixture is used that contains solutes with average radii of 1 nm. In one test, the concentration of the filtrate is found to be 2.17 g/L, while the concentration on the feed-side surface is 8.52 g/L.
Prior experimentation showed that the mass transfer coefficient in the device was approximately 9 × 10-4 cm/s.
A) If the total filtration flow rate is measured to be 0.56 cm^3/s, what is the solute concentration in the feed solution?
B) Explain how you could determine the average membrane pore radius for this membrane using this information.
Describe the structure and function of pumps
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…
Chapter 5 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
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,...
Knowledge Booster
Learn more about
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
- Why is it important to determine percent change in mass in regards of an Osmosis Experiment ?arrow_forwardWhereas 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_forward
- Explain why negative charges in the filtration membrane are able to repel protein which are negative charges but not chlorine ionsarrow_forwardDescribe the mechanism by which a transporter of a mediatedtransport system moves a solute from one side of a membrane to the other.arrow_forwardIn cardiac muscle cells, the sodium-calcium exchanger maintains a low Ca²+ concentration in the cytoplasm. This antiporter works by exporting a single calcium ion for the import of three sodium ions. Find AG for the overall reaction.arrow_forward
- If the activity of the Na+/HCO3− symporter were increased, how would blood pH change? Why?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_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_forward
- In 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_forwardfor the following scenario, DRAW the situation depicted, INDICATE which solution is hypertonic, hypotonic or isotonic (if applicable), and then show with ARROWS which way water will move. then write your response in complete sentences, thoroughly explaining and justifying your arrows. a. ouch! sore throat! it is so swollen that it is sore and it is difficult to swallow. and you have an oral presentation today. better gargle with salt water to reduce the swelling! explain why this age old technique really works, by using the concept of osmosisarrow_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_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning