Fundamentals of Biochemistry: Life at the Molecular Level
5th Edition
ISBN: 9781118918401
Author: Donald Voet, Judith G. Voet, Charlotte W. Pratt
Publisher: WILEY
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Chapter 9, Problem 1E
Summary Introduction
To determine: Whether trans-oleic acid has a higher or lower melting point than cis-oleic acid.
Concept introduction: An oleic acid is a colorless and odorless fatty acid. It occurs naturally in different animal and vegetable fats and oils. In its triglyceride form, oleic acid is used as a component in many foods. As they are part of the animal fats and vegetable oils, oleic acid can be used as components in normal human diet.
Expert Solution & Answer
Answer to Problem 1E
Answer: Trans-oleic acid has a higher melting point than cis-oleic acid.
Explanation of Solution
Explanation:
Trans isomers have a higher melting point compared to cis isomers. It is mainly because of the less-stearic hindrance of trans isomers. Trans-oleic acids have a melting point of 44.5°C and cis-oleic acids have a melting point of 13.4°C. The trans isomer of oleic acid is able to pack together easier because of less stearic hindrance. However, it is difficult to pack the cis isomer together due to its higher stearic hindrance. The cis isomer has a “U” shape but the trans isomer is more planar. This allows for better packing in trans isomers. Due to all these reasons, trans-oleic acid has a higher melting point than cis-oleic acid.
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Chapter 9 Solutions
Fundamentals of Biochemistry: Life at the Molecular Level
Ch. 9 - Prob. 1ECh. 9 - 2. Which triacylglycerol yields more energy on...Ch. 9 - 3. Draw the structure of a glycerophospholipid...Ch. 9 - 4. Name this lipid.
Ch. 9 - Prob. 5ECh. 9 - 6. What products are obtained when...Ch. 9 - 7. Which of the glycerophospholipid head groups...Ch. 9 - Prob. 8ECh. 9 - 9. Identify the hormone molecule shown here. What...Ch. 9 - 10. Draw the structure of the fatty acid amide...
Ch. 9 - Prob. 11ECh. 9 - Prob. 12ECh. 9 - Prob. 13ECh. 9 - Prob. 14ECh. 9 - Prob. 15ECh. 9 - Prob. 16ECh. 9 - 17. (a) How many turns of an ? helix are required...Ch. 9 - 18. The distance between successive C? atoms in a...Ch. 9 - 19. Are the following lipid samples likely to...Ch. 9 - 20. In order to consume and dispose of dying...Ch. 9 - 21. Sphingosine-1-phosphate can serve as a cell...Ch. 9 - 22. Lipids known as sulfatides occur in cells of...Ch. 9 - 23. In some autoimmune diseases, an individual...Ch. 9 - 24. Most hormones, such as peptide hormones, exert...Ch. 9 - 25. E. coli outer membranes include a component...Ch. 9 - 26. Archaebacteria and Eubacteria produce...Ch. 9 - 27. Shigella bacteria cause severe diarrhea by...Ch. 9 - 28. The inner membranes of mitochondria are rich...Ch. 9 - 29. Describe the labeling pattern of glycophorin....Ch. 9 - 30. Identify a 20-residue segment that could form...Ch. 9 - 31. Macropinocytosis is a variation of endocytosis...Ch. 9 - 32. Explain why the action of phospholipase A2 on...Ch. 9 - 33. Predict the effect of a mutation in signal...Ch. 9 - 34. Explain why a drug that interferes with the...Ch. 9 - 35. The symmetries of oligomeric integral proteins...Ch. 9 - Prob. 36CQCh. 9 - MORE TO EXPLORE Some of the more unusual membrane...
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