Biology chapter 7

Biology chapter 7 - Biology 7e(Campbell Chapter 7 Membrane...

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Biology, 7e (Campbell) Chapter 7: Membrane Structure and Function Chapter Questions For the following questions, match the membrane model or description with the scientist(s) who proposed the model. Each choice may be used once, more than once, or not at all. A. H. Davson and J. Danielli B. I. Langmuir C. C. Overton D. S. Singer and G. Nicolson E. E. Gorter and F. Grendel 1) The first to propose that cell membranes are phospholipid bilayers. 2) Membranes are a phospholipid bilayer between two layers of hydrophilic proteins. 3) The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids. For the following questions, match the labeled component of the cell membrane (Figure 7.1) with its description. Figure 7.1 4) peripheral protein 5) cholesterol 6) fiber of the extracellular matrix 7) microfilament of the cytoskeleton 8) glycolipid
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9) When biological membranes are frozen and then fractured, they tend to break along the middle of the bilayer. The best explanation for this is that A) the integral membrane proteins are not strong enough to hold the bilayer together. B) water that is present in the middle of the bilayer freezes and is easily fractured. C) hydrophilic interactions between the opposite membrane surfaces are destroyed on freezing. D) the carbon-carbon bonds of the phospholipid tails are easily broken. E) the hydrophobic interactions that hold the membrane together are weakest at this point. 10) All of the following molecules are part of the cell membrane except A) lipids. B) nucleic acids. C) proteins. D) phosphate groups. E) steroids. 11) The presence of cholesterol in the plasma membranes of some animals A) enables the membrane to stay fluid more easily when cell temperature drops. B) enables the animal to remove hydrogen atoms from saturated phospholipids. C) enables the animal to add hydrogen atoms to unsaturated phospholipids. D) makes the membrane less flexible, allowing it to sustain greater pressure from within the cell. E) makes the animal more susceptible to circulatory disorders.
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This note was uploaded on 11/23/2009 for the course BIO 066.6 taught by Professor Darby during the Spring '09 term at Sierra.

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Biology chapter 7 - Biology 7e(Campbell Chapter 7 Membrane...

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