CAMPBELL BIOLOGY MOD MASTERING (18 WEEK)
12th Edition
ISBN: 9780136920335
Author: Urry
Publisher: PEARSON
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Chapter 7, Problem 7TYU
EVOLUTION CONNECTION Paramecium and other unicellular eukaryotes that live in hypotonic environments have cell membranes that limit water uptake, while those living in isotonic environments have membranes that are more permeable to water. Describe what water regulation adaptations might have evolved in unicellular eukaryotes in hypertonic habitats such as the Great Salt Lake and in habitats with changing salt concentration.
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Explain osmotic balance in cells. What happens to a cell that is placed in a hypotonic solution, hypertonic solution, or isotonic solution? What is special about the maintenance of osmotic balance in halophiles that would allow them to survive in high salt concentrations? What is the natural habitat of archaea species Halobacterium salinarum?
Using the appropriate osmotic terms (hypertonic, hypotonic, or isotonic) describe what would happen to each organism in the following settings:
A single-celled freshwater protist is placed into a beaker of salt water.
A salt-water snail is mistakenly put into a freshwater tank.
A head of lettuce is placed soaked in a sink of salt water.
A carrot is soaked a sink of distilled, pure water.
3
Diagram A below illustrates schematically a classic experiment designed to test the chemi-
osmotic hypothesis. Phospholipid vesicles were made to contain beef heart mitochondrial ATP syn-
thase and bacteriorhodopsin, a light driven proton pump isolated from Halobacterium holobium. Under
light illumination, proton translocation by bacteriorhodopsin results in ATP synthesis when ADP and
inorganic phosphate (Pi) are added to the suspension of vesicles. Diagram B shows a plot of the rate
of ATP synthesis as a function of the proton gradient ApH.
Bacteriorhodopsin in
synthetic vesicle
100F
A
outside
inside
5아
Fo
F1
0.3
0.6
0.9
1.2
A pH
(a)
how this differs from its orientation in mitochondria.
Given the orientation of the components of ATP synthase complex in diagram A, describe
(b)
cavity of the vesicle become the region of low proton concentration or the region of high proton con-
centration? Explain your reasoning.
Under light illumination to activate bacteriorhodopsin to drive ATP…
Chapter 7 Solutions
CAMPBELL BIOLOGY MOD MASTERING (18 WEEK)
Ch. 7.1 - VISUAL SKILLS Carbohydrates are attached to...Ch. 7.1 - Prob. 2CCCh. 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 - Prob. 1CCCh. 7.3 - WHAT IF? If a Paramecium swims from a hypotonic...Ch. 7.4 - Prob. 1CCCh. 7.4 - Prob. 2CCCh. 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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- The pre-cell (before the appearance of life) formed during Chemical Evolution has an outer membrane that is a phospholipid bilayer. Given the properties of the water in the prebiotic ocean. One would expect that H2O and ions would: A) move through the fatty acid layer of the phospholipid bilayer out of the pre-cell, B) be unable to move through the bilayer, C) move through the phosphate groups in the pre cell phospholipid bilayer and move into cell, D) dissolve the bilayer, E) transport proteins into the pre cell.arrow_forwardSuppose you have a cell from a freshwater fish that is isotonic with its surrounding environment, with a K+ concentration inside the cell of 0.05M. You then immerse this cell in saltwater where the K+ concentration is 0.25M. What would you predict will happen to the cell? a)Water will move into the cell, and the cell will swell and burst b)Water will move out of the cell, and the cell will shrink c)Water will move in and out of the cell with no net change in concentration, and the cell will remain the same size d)The cell wall will prevent the cell from changing sizearrow_forwardDraw one elodea cell (freshwater plant) after being in saltwater. Label its choloroplast, cell wall, plasma membrane, nucleus, and central vacuole. Which ones are present? 1b) Based on this drawing, which structure is keeping the elodea from going through osmotic lysis in its habitat?arrow_forward
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