
Concept explainers
What is the basis for deciding if a substance is a lipid?

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.
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
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