Chemistry for Today: General Organic and Biochemistry
9th Edition
ISBN: 9781337514576
Author: Seager
Publisher: Cengage
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Textbook Question
Chapter 18, Problem 18.1E
What is the basis for deciding if a substance is a lipid?
Expert Solution & Answer
Interpretation Introduction
Interpretation:
The basis for the decision that a substance is a lipid is to be stated.
Concept introduction:
Lipids are organic compounds which are fatty acids or the derivatives of fatty acids. They are insoluble in water but are soluble in non-polar organic solvents. They include natural oils, waxes, and steroids. Lipids are present in the cell membrane of the living cell.
Answer to Problem 18.1E
When a biological substance is greasy, waxy, oily and insoluble in water, then the substance is considered as a lipid.
Explanation of Solution
Lipids are one of those macromolecular substances that are present in the living cell. Lipid composes the cell membrane of the living cell. The lipids have a greasy, waxy and oily texture. The lipids are insoluble in water. Therefore, it can be easily decided that a substance is a lipid or not by checking these characteristics of lipid.
Conclusion
When a biological substance is greasy, waxy, oily and insoluble in water, then the substance is considered as a lipid.
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Chapter 18 Solutions
Chemistry for Today: General Organic and Biochemistry
Ch. 18 - What is the basis for deciding if a substance is a...Ch. 18 - List two major functions of lipids in the human...Ch. 18 - What functional group is common to all...Ch. 18 - Prob. 18.4ECh. 18 - Prob. 18.5ECh. 18 - Describe four structural characteristics exhibited...Ch. 18 - Describe the structure of a micelle formed by the...Ch. 18 - Prob. 18.8ECh. 18 - Prob. 18.9ECh. 18 - Explain why the melting points of unsaturated...
Ch. 18 - What structural feature of a fatty acid is...Ch. 18 - How are fats and oils structurally similar? How...Ch. 18 - From Figure 18.7, arrange the following substances...Ch. 18 - Draw the structure of a triglyceride that contains...Ch. 18 - Prob. 18.15ECh. 18 - The percentage of fatty acid composition of two...Ch. 18 - Prob. 18.17ECh. 18 - Prob. 18.18ECh. 18 - Prob. 18.19ECh. 18 - Why is the hydrogenation of vegetable oils of...Ch. 18 - Prob. 18.21ECh. 18 - Write reactions to show how each of the following...Ch. 18 - Draw the structure of a wax formed from oleic acid...Ch. 18 - Prob. 18.24ECh. 18 - Draw the structure of a wax formed from stearic...Ch. 18 - Prob. 18.26ECh. 18 - Prob. 18.27ECh. 18 - Draw the general block diagram structure of a...Ch. 18 - Draw the structure of a phosphoglyceride...Ch. 18 - Describe two biological roles served by the...Ch. 18 - Prob. 18.31ECh. 18 - What is the structural difference between a...Ch. 18 - Prob. 18.33ECh. 18 - Prob. 18.34ECh. 18 - List two structural differences between...Ch. 18 - Prob. 18.36ECh. 18 - Describe the structural similarities and...Ch. 18 - Give another name for glycolipids. In what tissues...Ch. 18 - Prob. 18.39ECh. 18 - Prob. 18.40ECh. 18 - How does the polarity of the phosphoglycerides...Ch. 18 - Prob. 18.42ECh. 18 - Prob. 18.43ECh. 18 - Prob. 18.44ECh. 18 - Explain how bile salts aid in the digestion of...Ch. 18 - Prob. 18.46ECh. 18 - Prob. 18.47ECh. 18 - Prob. 18.48ECh. 18 - Prob. 18.49ECh. 18 - Prob. 18.50ECh. 18 - How are testosterone and progesterone structurally...Ch. 18 - Prob. 18.52ECh. 18 - Prob. 18.53ECh. 18 - Prob. 18.54ECh. 18 - Prob. 18.55ECh. 18 - Prob. 18.56ECh. 18 - Prob. 18.57ECh. 18 - Prob. 18.58ECh. 18 - Prob. 18.59ECh. 18 - Prob. 18.60ECh. 18 - Prob. 18.61ECh. 18 - Prob. 18.62ECh. 18 - Prob. 18.63ECh. 18 - Prob. 18.64ECh. 18 - Prob. 18.65ECh. 18 - Prob. 18.66ECh. 18 - Prob. 18.67ECh. 18 - Prob. 18.68ECh. 18 - Prob. 18.69ECh. 18 - Prob. 18.70ECh. 18 - Prob. 18.71ECh. 18 - When a doughnut is placed on a napkin, the napkin...Ch. 18 - Fats belong to the class of organic compounds...Ch. 18 - Identify each of the following characteristics as...Ch. 18 - Identify which sex hormones testosterone,...Ch. 18 - Prob. 18.76ECh. 18 - In diseases of the gallbladder, which of the...Ch. 18 - Steroids are classified as: a.carbohydrates....Ch. 18 - Accumulation of cholesterol leads to the hardening...Ch. 18 - Cholesterol, in spite of its bad reputation, is an...Ch. 18 - Bile is manufactured in the: a. duodenum. b....Ch. 18 - The basic structure of cell membrane is a: a....Ch. 18 - The mineralocorticoid _____ is a product of the...Ch. 18 - Prob. 18.84ECh. 18 - Prob. 18.85E
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