Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892


Chapter 3, Problem 6TYK
Textbook Problem

Which of the following statements about steroids is false?

a. They are classified as lipids because, like lipids, they arenonpolar.

b. They can act as regulatory molecules in animals.

c. They are composed of four carbon rings.

d. They are highly soluble in water.

e. Their most abundant form is as sterols.

Expert Solution
Summary Introduction


Lipids are biomolecules that are mostly nonpolar in nature. The lipids are either neutral lipids, phospholipids, or steroids. Neutral lipids include triglycerides and waxes. These are composed of fatty acids and alcohol (glycerol or long chain alcohols). Phospholipids are composed of fatty acids, glycerol, and a phosphate group. Steroids do not contain glycerol or fatty acids.

Explanation of Solution

Justification for the correct answer:

Option (d) is given that steroids are soluble in water. Steroids are considered as lipids, which are composed of hydrocarbon skeleton. Thus, they are insoluble in water and are nonpolar in nature. However, they solubilize in organic solvents. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is given that steroids are classified as lipids because they are nonpolar. This statement is true because steroids only share this characteristic with other types of lipids as they contain hydrocarbons that are hydrophobic in nature. Structurally, the steroids are very different from other lipids. So, it is an incorrect option

Option (b) is given that steroids act as regulatory molecules in animals...

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