Campbell Essential Biology (6th Edition) - standalone book
6th Edition
ISBN: 9780133917789
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 4, Problem 10PS
Plant seeds store oils as droplets. An oil droplet membrane is a single layer of phospholipids. Draw a model for such a membrane. Explain why it is more stable than a bilayer.
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If you place phospholipids in an oil-based solution, would they still self-assemble into a bilayer? If so, describe its structure.
Part a) Would a single alpha helix be more stable in a aqueous solution or a membrane. Explain why.
Part b) Why do transmembrane proteins always have secondary structures inside the membrane but aqueous proteins do not?
Part c) If you had a single alpha helix, can it act as a pore for a membrane. Explain.
Draw a sketch of a lipid bilayer, the structure that forms when a lipid such as phosphatidyl serine is dissolved in water.
Chapter 4 Solutions
Campbell Essential Biology (6th Edition) - standalone book
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- Cell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECMarrow_forwardThe tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicarrow_forwardWhich of these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeabilityarrow_forward
- It seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.arrow_forwardDraw the basic structure of a lipid bilayer and label thehydrophilic and hydrophobic regions. Why is the cytoplasmicmembrane a good permeability barrier?arrow_forward. Cholesterol is an integral part of plasma membranes.Based on its structure, where is it found in themembrane?a. on the extracellular surfaceb. embedded with the phospholipid headsc. within the tail bilayerd. attached to the intracellular surfacearrow_forward
- Part a) Explain the entropic and enthalpic arguments for micelle formation. Part b) Explain the entropic and enthalpic arguments for a bilayer formation.arrow_forwardWhat is an example of a phospholipid bilayer?arrow_forwardThe cells of plant seeds store oils in the form of droplets enclosed by membranes. Unlike the membranes you learned about in this chapter, the oil droplet membrane consists of a single layer of phospholipids rather than a bilayer. Draw a model for a membrane around an oil droplet. Explain why this arrangement is more stable than a bilayer.arrow_forward
- How many phospholipid molecules are there in a 1-μm region of a phospholipid bilayer membrane? Assume that a phospholipid molecule occupies 70 Å of the surface area.arrow_forwardExplain the following statement: The structure of all biomembranes depends on the chemical properties of phospholipids, whereas the function of each specific biomembrane depends on the specific proteins associated with that membrane.arrow_forwardCompare the hydrophobic forces that hold a membrane protein in the lipid bilayer with those that help proteins fold into a unique three-dimensional structure.arrow_forward
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