CAMPBELL BIOLOGY V.1 W/MAST BIOL >CI<
2nd Edition
ISBN: 9781323740477
Author: Reece
Publisher: Pearson Custom Publishing
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Textbook Question
Chapter 7.3, Problem 2CC
WHAT IF? Ø If a Paramecium swims from a hypotonic to an isotonic environment, will its contractile vacuole become more active or less? Why?
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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.
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MAKE CONNECTIONS Explain why the set of forces driving ionmovement across the plasma membrane of a cell is described as anelectrochemical (electrical and chemical) gradient (see Concept 7.4).
Chapter 7 Solutions
CAMPBELL BIOLOGY V.1 W/MAST BIOL >CI<
Ch. 7.1 - VISUAL SKILLS Carbohydrates are attached to...Ch. 7.1 - WHAT IF? How would the membrane lipid composition...Ch. 7.2 - What property allows O2 and CO2 to cross a lipid...Ch. 7.2 - VISUAL SKILLS Examine Figure 7.2. Why is a...Ch. 7.2 - MAKE CONNECTIONS Aquaporins exclude passage of...Ch. 7.3 - How do you think a cell performing cellular...Ch. 7.3 - WHAT IF? If a Paramecium swims from a hypotonic...Ch. 7.4 - Sodium-potassium pumps help nerve cells establish...Ch. 7.4 - VISUAL SKILLS Compare the sodium-potassium pump...Ch. 7.4 - MAKE CONNECTIONS Review the characteristics of...
Ch. 7.5 - As a cell grows, its plasma membrane expands. Does...Ch. 7.5 - DRAW IT Return to Figure 7.9, and circle a patch...Ch. 7.5 - Prob. 3CCCh. 7 - In what ways are membranes crucial to life?Ch. 7 - How do aquaporins affect the permeability of a...Ch. 7 - What happens to a cell placed in a hypertonic...Ch. 7 - ATP is not directly involved in the functioning of...Ch. 7 - Which type of endocytosis involves the binding of...Ch. 7 - In what way do the membranes of a eukaryotic Cell...Ch. 7 - According to the fluid mosaic model of membrane...Ch. 7 - Which of the following factors would tend to...Ch. 7 - Which of the following processes includes all the...Ch. 7 - Prob. 5TYUCh. 7 - DRAW IT An artificial "cell" consisting of an...Ch. 7 - EVOLUTION CONNECTION Paramecium and other...Ch. 7 - Prob. 8TYUCh. 7 - SCIENCE, TECHNOLOGY, AND SOCIETY Extensive...Ch. 7 - WRITE ABOUT A THEME: INTERACTIONS A human...Ch. 7 - SYNTHESIZE YOUR KNOWLEDGE In the supermarket,...
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- . WHAT IF? Suppose a cell’s membrane potential shiftsfrom -70 mV to -50 mV. What changes in the cell’spermeability to K+or Na+could cause such a shift?arrow_forwardQ1: What would the second diagram look like if the pores in the semipermeable membrane were too small to allow water molecules to pass through? Q2: What would the second diagram look like if the pores were large enough to let both water molecules and sugar molecules through? Q3: The fluid in an IV bag is isotonic to blood. What change would you see in the red blood cells of a patient if a bag of a hypertonic solution was used in error?arrow_forwardWHAT IF? Suppose a membrane surrounded an oildroplet, as it does in the cells of plant seeds and in someanimal cells. Describe and explain the form it might takearrow_forward
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- Q1: 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_forwardQ41: Can you answer all the parts to this question A: Regarding jellyfish swimming, the recovery stroke of the jellyfish swimmimg mechanism, the medusa is returned to its resting state by B: Regarding substance transport, why must diffusion distances be kept short?arrow_forwardQ1: 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_forward
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