Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 7, Problem 7.6PS
QUANTITATIVE That’s About the Size of It. From chemistry, we know that each methylene (—CH2—) group in a straight-chain hydrocarbon advances the chain length by about 0.13 nm. And from studies of protein structure, we know that one turn of an α helix includes 3.6 amino acid residues and extends the long axis of the helix by about 0.56 nm. Use this information to answer the following.
(a) How long is a single molecule of palmitate (16 carbon atoms) in its fully extended form? What about molecules of laurate (12 C) and arachidate (20 C)?
(b) How does the thickness of the hydrophobic interior of a typical membrane compare with the length of two palmitate molecules laid end to end? What about two molecules of laurate or arachidate?
(c) Approximately how many amino acids must a helical transmembrane segment of an integral membrane protein have if the segment is to span the lipid bilayer defined by two palmitate molecules laid end to end?
(d) The protein bacteriorhodopsin has 248 amino acids and seven transmembrane segments. Approximately what portion of the amino acids are part of the transmembrane segments? Assuming that most of the remaining amino acids are present in the hydrophilic loops linking the transmembrane segments together, approximately how many amino acids are present in each of these loops, on average?
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Chapter 7 Solutions
Becker's World of the Cell (9th Edition)
Ch. 7 - Which functions of a membrane would be compromised...Ch. 7 - Which of the three historical strands forming...Ch. 7 - Lipids form the fluid part of the fluid mosaic...Ch. 7 - A researcher has carried out a PAGE experiment to...Ch. 7 - Proteins can be attached to the membrane in a...Ch. 7 - Functions of Membranes. For each of the following...Ch. 7 - Elucidation of Membrane Structure. Each of the...Ch. 7 - Wrong Again. For each of the following false...Ch. 7 - QUANTITATIVE Gorter and Grendel Revisited. Gorter...Ch. 7 - Prob. 7.5PS
Ch. 7 - QUANTITATIVE Thats About the Size of It. From...Ch. 7 - Temperature and Membrane Composition. Which of the...Ch. 7 - Membrane Fluidity and Temperature. The effects of...Ch. 7 - The Little Bacterium That Cant. Acholeplasma...Ch. 7 - Hydropathy: The Plot Thickens. A hydropathy plot...Ch. 7 - Problem Set Inside or Outside? From Figure 7-22,...Ch. 7 - Prob. 7.12PS
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