Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 2IQ
- a. Cite some experimental evidence that indicates that membrane proteins drift.
- b. How might the membrane composition of membrane lipids differ for two populations of fish if one lives in cold mountain lakes and the other in warm valley ponds?
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What does the fluid part of the fluid mosaic model represent?
a. Constant movement of the hydrophilic tails in the interior of the membrane
b. The thin layer of water that is sandwitched between the to layers of lipids
c. Lipid molecules, which freely move among other lipids within the same half of the bilayer
d. Free movement of cholesterol molecules within the membrane
a) What are the forces that maintain structural integrity of biological membranes?b) Explain how each force mentioned is formed in membrane lipids. c) Comment on lipid to protein ratio in the membrane of molecules that transport insoluble substances in the blood.
Cold-blooded organisms may adapt to changing environments by making their membranes more fluid when it is very cold or less fluid when it is very hot heat. Explain in 20 words or fewer how an organism's membranes would change at the molecular level to adapt to a very hot environment
Chapter 7 Solutions
Study Guide for Campbell Biology
Ch. 7 - Label the components in the following diagram of a...Ch. 7 - a. Cite some experimental evidence that indicates...Ch. 7 - List the six major functions that membrane...Ch. 7 - What types of molecules have difficulty crossing...Ch. 7 - A solution of 1 M glucose is separated by a...Ch. 7 - a. What osmotic problems does the freshwater...Ch. 7 - Prob. 7IQCh. 7 - Prob. 8IQCh. 7 - a. How is cholesterol transported into human...Ch. 7 - Create a concept map to illustrate your...
Ch. 7 - The following diagram illustrates passive and...Ch. 7 - If a single layer of phospholipids coats the water...Ch. 7 - Glycoproteins and glycolipids are important for a....Ch. 7 - Prob. 3TYKCh. 7 - Prob. 4TYKCh. 7 - Prob. 5TYKCh. 7 - Use the following U-tube setup to answer questions...Ch. 7 - Use the following U-tube setup to answer questions...Ch. 7 - Use the following U-tube setup to answer questions...Ch. 7 - How much work is expended in diffusion? a. an...Ch. 7 - Prob. 10TYKCh. 7 - Prob. 11TYKCh. 7 - Water passes quickly through cell membranes...Ch. 7 - Facilitated diffusion of ions across a cellular...Ch. 7 - Prob. 14TYKCh. 7 - Which of the following describes cotransport? a....Ch. 7 - Prob. 16TYKCh. 7 - An animal cell moves potassium against its...Ch. 7 - Prob. 18TYKCh. 7 - Prob. 19TYKCh. 7 - In response to low blood pressure, the adrenal...
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- Please answer fast Compare and contrast the protein sorting of proteins destined for extracellular secretion, the mitochondrial matrix, and the nucleus.arrow_forwardDescribe some of the activities performed by membrane proteins in multicellular organisms.arrow_forwardIn the "fluid " _______ cell membrane model, lipids are organized in a ________ arrangement, such that _______ portions of the lipids are exposed to either the interior or exterior of the cell, while the lipid portions are sandwiched in the middle of the membrane. As part of the cell membrane, a main function of peripheral proteins is to provide _________ , while a main function of proteins is to provide _________ . Other cell membrane molecules include a compound called __________, which functions to provide fluidity to rigid membranes and rigidity to fluid membranes; and surface carbohydrates, which function in the membrane not to provide energy, but instead to provide _________ _____ . Aminophospholipids (including PE and ) move to the inner leaflet of the membrane, by an enzyme known as the ._______ A main function of the cell membrane is to be very selective as to what is able to cross through, a condition known as a barrier.arrow_forward
- One of the following is TRUE? A. The transport of Na+ across cell membranes depends solely on concentration gradient B. The transport of sucrose across cell membranes depends solely on concentration gradient C. The transport of K+ across cell membranes depends solely on concentration gradient D. The transport of Ca2+ across cell membranes depends solely on concentration gradient E. A & Carrow_forwardBiology a. Assuming a protein is present in the cell at 1 µM concentration, how many copies of that protein are present (on average) in a 1 µm3 volume (roughly the volume of a bacterium)? b. What is the corresponding volume per molecule in nm3? c. If the protein were approximately spheres with diameter 5 nm, what fraction of the volume would the protein (still at 1 µM) occupy? d. Repeat part a of this question, but now with concentration 1 nM. e. Repeat part a of this question, but now for a yeast cell (assume yeast cell is a sphere with diameter 5 µm)..arrow_forwardBased on the picture, B. What is the primary function of #5 within a cell? A. Form membranes B. Store energy C. Structural support D. Maintain constant pHarrow_forward
- What is the role of cholesterol in animal cell membranes? A. Blocks the association of the fatty acyl chains of phospholipids at high temperature. B. Is a receptor site for hormones on the surface of membranes. C. Broadens the temperature range of optimum membrane fluidity. D. Aids in the transport of small hydrophobic molecules across the membrane. A fatty acid designated as 20:0 is ________, while one that is designated 20:3 delta ^5,8,11 is ________. A. complex; simple B. unsaturated; saturated C. saturated; unsaturated D. simple; complex E. monounsaturated; polyunsaturatedarrow_forwarda) Give the two main membrane proteins.b) State a function each of the mentioned protins. c) Explain why change in pH can affect the function of the proteins.arrow_forwardAnswer the following questions about the cell membrane; a) How are the phospholipids in the structure of the cell membrane called due to their tendency towards water?b) How do you interpret the transitions of lipophilic and hydrophilic substances that will pass through the cell membrane and the energy requirement in this context?c) State some of the features that cross the cell membrane and make "porin proteins" specific.d) Briefly clarify the concepts of "acylation", "prenylation" and "GPI stabilizer" in the context of membrane protein interactions.e) When determining ABO Blood Groups, give information about which blood group data can be obtained depending on the interaction of which antigens in the red blood cell and which antibodies in the serum.arrow_forward
- Integral proteins associate with the membrane through A. covalent attachment to lipids. B. covalent attachment to lipid anchors such as palmitoyl groups. C. hydrophobic interactions with lipids. D. interactions with carbohydrates attached to lipids.arrow_forwardAccording to the fluid mosaic model of membrane structure,proteins of the membrane are mostly(A) spread in a continuous layer over the inner and outersurfaces of the membrane.(B) confined to the hydrophobic interior of the membrane.(C) embedded in a lipid bilayer.(D) randomly oriented in the membrane, with no fixed insideoutside polarity.arrow_forwardWhich of the following is true about motion of membrane lipids? A. They can move most rapidly when in the gel phase. B. Lateral diffusion is catalyzed by flippase proteins. C. To increase the fluidity of membranes at low temperatures, cells synthesize more saturated fatty acids and fewer unsaturated fatty acids. D. Transbilayer diffusion involves the transfer of lipids from one face of the bilayer to another.arrow_forward
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