Which one of the following is not a lipid?
Correct answer: B. Chitin
- A. Rubber
- B. Chitin
- C. Cutin
- D. Cholesterol
Explanation
Chitin is the correct answer because it is a polysaccharide, not a lipid. It forms structural components in organisms, such as the exoskeletons of arthropods and the cell walls of fungi. On the other hand, rubber, although not a lipid, is composed of isoprene polymers, which are more related to hydrocarbons. Cutin, a protective waxy polymer in plants, and cholesterol, a critical component of cell membranes and a precursor for steroid hormones, are both classified as lipids.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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