Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Textbook Question
Chapter 5, Problem 4AC
Some cells in the nervous system wrap themselves around parts of neurons, serving as insulation for the electrical signals that flow inside neurons carried by ions. Given the general roles of protein and lipids in the cell membrane, which component would you predict to be more abundant in these insulating cells? Explain.
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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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- 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.arrow_forwardPhospholipids (Which is charged, what is the functional significance? Are they preferentially located on cytosolic or extracellular lipid monolayer? What is the functional significance of plasma membrane asymmetry?)arrow_forwardThe plasma membrane of E. coli is about 75% protein and 25% phospholipid by weight. How many molecules of membrane lipid are present for each molecule of membrane protein? Assume an average protein Mr of 50,000and an average phospholipid Mr of 750. What more would you need to know to estimate the fraction of the membrane surface that is covered by lipids?arrow_forward
- Which of the following does not apply to lipid asymmetry? a.It arises in the endoplasmic reticulum. b.It arises due to the flip-flop movement of specific phospholipids to the cytosolic monolayer. c.It is preserved throughout vesicular transport. d.It depends on the activity of flippase.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_forwarda. What characteristic of phospholipids makes them essentialcomponents of cell membranes?b. How are saturated and unsaturated fatty acids different?c. Why is the hydrophilic end of phospholipids attracted to water?arrow_forward
- A phospholipid in cell membrane is an amphiphilic molecule, meaning it has both a hydrophilic region and a hydrophobic region. Suppose the phospholipid loses this property, what consequences will it bring to the cell.arrow_forwardThree proteins that facilitate the movement of phospholipidmolecules across a membrane are flippase, floppase, and_________________________.arrow_forwardIn lipid bilayers, there is an order– disorder transition similar to the melting of a crystal. In a lipid bilayer in which most of the fatty acids are unsaturated, would you expect this transition to occur at a higher temperature, a lower temperature, or the same temperature as it would in a lipid bilayer in which most of the fatty acids are saturated? Why?arrow_forward
- Why can’t triacylglycerols be significant components of lipid bilayers?arrow_forwardPeripheral membrane proteins are not amphipathic and do not associate with the nonpolar regions of the lipids? Explain why?arrow_forwardLipid bilayers formed between two aqueous phases have this important property: they form two-dimensional sheets, the edges of which close upon each other and undergo self-sealing to form vesicles (liposomes). What properties of lipids are responsible for this property of bilayers? Explain What is the significance of this property regarding the structure of biological membranes?arrow_forward
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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license