Biochemistry
9th Edition
ISBN: 9781305961135
Author: Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher: Cengage Learning
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Chapter 8, Problem 23RE
REFLECT AND APPLY In 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?
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Chapter 8 Solutions
Biochemistry
Ch. 8 - RECALL Proteins, nucleic acids, and carbohydrates...Ch. 8 - RECALL What structural features do a...Ch. 8 - RECALL Draw the structure of a phosphoacylglycerol...Ch. 8 - RECALL What structural features do a sphingomyelin...Ch. 8 - RECALL You have just isolated a pure lipid that...Ch. 8 - RECALL What structural features does a...Ch. 8 - RECALL Write the structural formula for a...Ch. 8 - RECALL How does the structure of steroids differ...Ch. 8 - Prob. 9RECh. 8 - REFLECT AND APPLY Which is more hydrophilic,...
Ch. 8 - Prob. 11RECh. 8 - REFLECT AND APPLY Succulent plants from arid...Ch. 8 - REFLECT AND APPLY In the produce department of...Ch. 8 - REFLECT AND APPLY Egg yolks contain a high amount...Ch. 8 - REFLECT AND APPLY In the preparation of sauces...Ch. 8 - REFLECT AND APPLY When water birds have had their...Ch. 8 - RECALL Which of the following lipids are not found...Ch. 8 - RECALL Which of the following statements is (are)...Ch. 8 - REFLECT AND APPLY Why might some food companies...Ch. 8 - Prob. 20RECh. 8 - BIOCHEMICAL CONNECTIONS Crisco is made from...Ch. 8 - BIOCHEMICAL CONNECTIONS Why does the American...Ch. 8 - REFLECT AND APPLY In lipid bilayers, there is an...Ch. 8 - Prob. 24RECh. 8 - REFLECT AND APPLY Suggest a reason why the cell...Ch. 8 - REFLECT AND APPLY Suggest a reason why animals...Ch. 8 - REFLECT AND APPLY What is the energetic driving...Ch. 8 - Prob. 28RECh. 8 - RECALL How can fluorescence techniques be used to...Ch. 8 - Prob. 30RECh. 8 - Prob. 31RECh. 8 - REFLECT AND APPLY A membrane consists of 50%...Ch. 8 - REFLECT AND APPLY Suggest a reason why the same...Ch. 8 - REFLECTANDAPPLY Suppose that you are studying a...Ch. 8 - REFLECT AND APPLY Which statements are consistent...Ch. 8 - RECALL What role does phosphorylation of tyrosine...Ch. 8 - Prob. 37RECh. 8 - REFLECT AND APPLY Suggest a reason why inorganic...Ch. 8 - REFLECT AND APPLY Which statements are consistent...Ch. 8 - RECALL What happens to the human growth hormone...Ch. 8 - Prob. 41RECh. 8 - RECALL What is the structural relationship between...Ch. 8 - Prob. 43RECh. 8 - RECALL What are isoprene units? What do they have...Ch. 8 - Prob. 45RECh. 8 - Prob. 46RECh. 8 - Prob. 47RECh. 8 - Prob. 48RECh. 8 - Prob. 49RECh. 8 - Prob. 50RECh. 8 - REFLECT AND APPLY A health-conscious friend asks...Ch. 8 - Prob. 52RECh. 8 - Prob. 53RECh. 8 - Prob. 54RECh. 8 - REFLECT AND APPLY List two classes of compounds...Ch. 8 - BIOCHEMICAL CONNECTIONS Outline a possible...
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- REFLECT AND APPLY A membrane consists of 50% protein by weight and 50% phosphoglycerides by weight. The average molecular weight of the lipids is 800 Da, and the average molecular weight of the proteins is 50,000 Da. Calculate the molar ratio of lipid to protein.arrow_forwardREFLECT AND APPLY An amylose chain is 5000 glucose units long. At how many places must it be cleaved to reduce the average length to 2500 units? To 1000 units? To 200 units? What percentage of the glycosidic links are hydrolyzed in each case? (Even partial hydrolysis can drastically alter the physical properties of polysaccharides and thus affect their structural role in organisms.)arrow_forwardREFLECT AND APPLY Comment on the energetics of protein folding in light of the information in this chapter.arrow_forward
- REFLECT AND APPLY The process of protein folding is spontaneous in the thermodynamic sense. It gives rise to a highly ordered conformation that has a lower entropy than the unfolded protein. How can this be?arrow_forwardREFLECT AND APPLY Aspirin is an acid with a pKa of 3.5; its structure includes a carboxyl group. To be absorbed into the bloodstream, it must pass through the membrane lining the stomach and the small intestine. Electrically neutral molecules can pass through a membrane more easily than can charged molecules. Would you expect more aspirin to be absorbed in the stomach, where the pH of gastric juice is about 1, or in the small intestine, where the pH is about 6? Explain your answer.arrow_forwardREFLECT AND APPLY Which statements are consistent with the fluid-mosaic model of membranes? (a) All membrane proteins are bound to the interior of the membrane. (b) Both proteins and lipids undergo transverse (flip-flop) diffusion from the inside to the outside of the membrane. (c) Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane. (d) Carbohydrates are covalently bonded to the outside of the membrane. (e) The term mosaic refers to the arrangement of the lipids alone.arrow_forward
- REFLECT AND APPLY What is the energetic driving force for the formation of phospholipid bilayers?arrow_forwardREFLECT AND APPLY Suggest a reason why the cell membranes of bacteria grown at 20C tend to have a higher proportion of unsaturated fatty acids than the membranes of bacteria of the same species grown at 37C. In other words, the bacteria grown at 37C have a higher proportion of saturated fatty acids in their cell membranes.arrow_forwardREFLECT AND APPLY An amino acid mixture consisting of lysine, leucine, and glutamic acid is to be separated by ion-exchange chromatography, using a cation-exchange resin at pH 3.5, with the eluting buffer at the same pH. Which of these amino acids will be eluted from the column first? Will any other treatment be needed to elute one of these amino acids from the column?arrow_forward
- REFLECT AND APPLY Draw Haworth projection formulas for dimers of glucose with the following types of glycosidic linkages: (a) A (14) linkage (both molecules of glucose in the form) (b) An ,(11) linkage (c) A (16) linkage (both molecules of glucose in the form)arrow_forwardREFLECT AND APPLY Theoretically, a protein could assume a virtually infinite number of configurations and conformations. Suggest several features of proteins that drastically limit the actual number.arrow_forwardREFLECT AND APPLY Which is more hydrophilic, cholesterol or phospholipids? Defend your answer.arrow_forward
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