What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 4, Problem 4SA
Summary Introduction
To analyze:
Why phospholipids are good as material for the plasma membrane.
Introduction:
Phospholipids are formed by a phosphate group connected to fatty acids by a glycerol.
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Which of the following is true about phospholipid bilayers?
The phospholipid portion of biological membranes is referred to as "selectively permeable". What does this term mean? What types of substances can cross the phospholipid bilayer? What types cannot?
What causes phospholipids to spontaneously orient themselves into a membrane-like structure?
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What Is Life? A Guide to Biology with Physiology
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- The following figure shows a typical phospholipid. Suppose this molecule was incorporated into a cell membrane. Which letter indicates the portion of the molecule that would be exposed to the aqueous environment? CH₂ I H₂C-N¹-CH₂ CH₂ A H₂C H₂C H₂C CH₂ CH₂O HO CH ₂ H₂C H₂C CH₂ OH HO O–CH, H₂C H₂C H₂C CH₂ HC CH₂ CH₂ CH-O CH-OH H₂C CH₂ H₂C CH₂ H₂C/ H₂C H₂C H₂C H₂C CH₂ H₂C CH₂ CH₂ CH₂ CH₂ CH₂ CH₂ CH₂ H₂C/arrow_forwardWhy is the cell membrane called a phospholipid bilayer?arrow_forwardIf you place phospholipids in an oil-based solution, would they still self-assemble into a bilayer? If so, describe its structure.arrow_forward
- In general terms, what would you expect to be different about the permeability of a lipid bilayer made of phospholipids (modern cells) and a bilayer made of fatty acids (protocell)?arrow_forwardBelow is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? H HO CH3 CH3 C-H + H-C-H Harrow_forwardWhich of the following is a true statement? Sphingolipids contain 2 hydrophobic, acyl chains Phospholipids contain 3 hydrophobic acyl chains Sphingolipids are completely no-polar, hydrophobic molecules The different types of phospholipids do not have different physical properties when in the membranearrow_forward
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