Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 5, Problem 2RQ
Summary Introduction
To review:
The arrangement that 10 phospholipid molecules, when placed in water. Also, give a reason as to why they arrange themselves in that particular orientation.
Introduction:
A phospholipid molecule is amphiphile and is made up of a polar head and a nonpolar tail. This polarity makes the head hydrophilic and the tail hydrophobic. The polar head is made up of phosphate group and glycerol. The nonpolar tail is made up of two fatty acid chains.
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Draw a sketch of a lipid bilayer, the structure that forms when a lipid such as phosphatidyl serine is dissolved in water.
If you place phospholipids in an oil-based solution, would they still self-assemble into a bilayer? If so, describe its structure.
Describe the structure of a phospholipid and explain which regions of the phospholipid are hydrophobic and which are hydrophilic.
Chapter 5 Solutions
Biology: Life on Earth
Ch. 5 -
1. Membranes consist of a bilayer of ________....Ch. 5 - A membrane that is permeable to some substances...Ch. 5 - Facilitated diffusion involves either _____...Ch. 5 - Prob. 4FTBCh. 5 -
5. After each molecule, place the two-word term...Ch. 5 - Prob. 6FTBCh. 5 - Describe and diagram the structure of a plasma...Ch. 5 - Prob. 2RQCh. 5 - What are the five categories of proteins commonly...Ch. 5 - Prob. 4RQ
Ch. 5 -
5. Define hypotonic, hypertonic, and isotonic....Ch. 5 -
6. Describe the following types of transport...Ch. 5 - Name the protein that allows facilitated diffusion...Ch. 5 - Imagine a container of glucose solution, divided...Ch. 5 - Prob. 9RQCh. 5 -
1. Different cells have different plasma...Ch. 5 - Predict and sketch the configuration of...Ch. 5 - The fluid portion of blood, in which red blood...Ch. 5 - Some cells in the nervous system wrap themselves...
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- Draw the general structure of a phospholipid.arrow_forwardWhat properties define the phospholipids that make up the lipid bilayer? Select all that apply. A. Nonpolar, hydrophobic hydrocarbon tails B. Polar, hydrophilic phosphate heads C. Nonpolar, hydrophobic phosphate heads D. Polar, hydrophilic hydrocarbon tailsarrow_forwardPhospholipids form lipid bilayers in water. What structure might form if phospholipids were placed in an organic solvent?arrow_forward
- Draw the basic structure of a lipid bilayer and label thehydrophilic and hydrophobic regions. Why is the cytoplasmicmembrane a good permeability barrier?arrow_forwardwhat will happen if the phospholipids only have 2 carbon in their structure instead of the usual or standard 3 carbon? give an example.arrow_forwardThe structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if A. Phospholipids had only one hydrocarbon tail instead of two?B. The hydrocarbon tails were shorter than normal, say, about 10 carbon atoms long?C. All of the hydrocarbon tails were saturated?D. All of the hydrocarbon tails were unsaturated?E. The bilayer contained a mixture of two kinds of phospholipid molecules, one with two saturated hydrocarbon tails and the other with two unsaturated hydrocarbon tails?F. Each phospholipid molecule were covalently linked through the end carbon atom of one of its hydrocarbon tails to a phospholipid tail in the opposite monolayer?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_forwardWhen a small amount of oil is added to a beaker of water con phospholipids, the phospholipids will surround the oil droplets forming micelles. Draw several cartoon representations of phospholipid molecules (with a head and tails) to show the arrangement or orientation of phospholipids in a micelle.arrow_forwardWhat are the properties of lipids responsible for the property of bilayers? Explain. What are the consequences of this property for the structure of the biological membranes?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_forwardWhich of the following molecules is not capable of forming lipid bilayers? a. glycolipids b. wax esters c. phospholipids d. cerebrosidesarrow_forwardWhich portion of the phospholipid would face the water molecules?arrow_forward
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