Multiple Choice
Which of the following is an example of a molecule from the class of lipids called steroids?
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4. Biomolecules
Lipids
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Which of the following is NOT a function of lipids in biological systems?
A
Energy storage
B
Insulation and protection
C
Forming cell membranes
D
Catalyzing biochemical reactions
Verified step by step guidance1
Understand the primary functions of lipids in biological systems. Lipids are a diverse group of molecules that play key roles such as energy storage, insulation and protection, and forming cell membranes.
Recall that lipids are hydrophobic molecules, which makes them ideal for forming the bilayer structure of cell membranes. This is a critical function in maintaining cellular integrity and regulating the movement of substances in and out of cells.
Recognize that lipids also serve as long-term energy storage molecules. They are more energy-dense than carbohydrates, providing a significant source of energy when metabolized.
Note that lipids contribute to insulation and protection in organisms. For example, adipose tissue in animals helps maintain body temperature and cushions vital organs.
Understand that catalyzing biochemical reactions is not a function of lipids. This role is typically performed by enzymes, which are proteins, not lipids. Therefore, the correct answer is that lipids do not catalyze biochemical reactions.
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