Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 5.3, Problem 2CC
WHAT IF? If a Paramecium caudatum cell swims from a hypotonic to an isotonic environment, will its contractile vacuole become more active or less? Why?
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Electrochemical gradients (a) power simple diffusion (b) are established by pinocytosis (c) are necessary for transport by aquaporins (d) are established by concentration gradients (e) are a result of both an electric charge difference and a concentration difference between the two sides of the membrane
Calculate the free energy changes at 20°C for the transmembrane movement of Na and K ions using the conditions presented
Figure 9.1. Assume the membrane potential is -70 mV. Use 3 significant figures.
AG (Na) -
AG (K) =
kJ. mol ¹
kJ mol2
A
WHAT IF? Some membrane proteins diffuse faster in the plasma membrane when the cytoskeleton or the extracellular matrix is artificially removed than when cells are unperturbed. Explain why.
Chapter 5 Solutions
Campbell Biology in Focus (2nd 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,...
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- Q16arrow_forwardQ1/ What is the relation between concentration gradient with Active & * ?passive transport إضافة ملفarrow_forwardQ1: In what ways is the plasma membrane a barrier, and in what ways is it a gatekeeper? Q2: Why can’t ions (such as Na+) cross the plasma membrane without the help of a transport protein? Q3: If no energy were available to the cell, what forms of transport would not be able to occur? What forms of transport could occur?arrow_forward
- How does blood plasm similarity compare to intracellular fluid osmolarity? Higher? Lower? The same?arrow_forward23arrow_forwardAccording to ‘Contriving Decent Demonstrations’ section of Vogel (1994), what is the connection between molecular diffusion at the level of the cell and multicellular complexity at the level of the organism?(Please according to Vogel (1994)) in 2 to 3 sentencesarrow_forward
- Q1: If endocytosis itself is nonspecific, how does receptor-mediated endocytosis bring only certain molecules into a cell? Q2: What sorts of molecules could be moved by endocytosis or exocytosis, but not by diffusion? Q3: How does the fluid that enters a cell via pinocytosis differ from the fluid that enters by osmosis?arrow_forwardQ11arrow_forwardWhat condition do animal cells prefer (hypotonic/isotonic/hypertonic)?arrow_forward
- Q50arrow_forward8. Define homeostasis. maintoining nterral balance 9. What role does the cell membrane play in maintaining homeostasis? 10. How is facilitated diffusion different from diffusion? How are they similar? 11. List two ways that active transport is different than passive transport. 1) 2) 12. Why is the sodium-potassium pump considered an active transport? Which direction are the sodium and potassium bing pumped? How many sodiums are being pumped? How many potassiums are being pumped?arrow_forwardLook carefully at the transmembrane proteins shown in Figure 11–29. What can you say about their mobility in the membrane?arrow_forward
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