Question

question 20 of 30
what biological molecules store energy and form the membranes around the cells of living organisms?

a. lipids
b. nucleic acids
c. carbohydrates
d. proteins

Explanation:

To solve this, we analyze each option:

• Option A: Lipids (like fats, oils) store energy and are a major component of cell membranes (phospholipids form the lipid bilayer).
• Option B: Nucleic acids (DNA, RNA) store genetic info, not energy or cell membranes.
• Option C: Carbohydrates (sugars, starches) are quick energy sources but not main membrane components.
• Option D: Proteins have roles like enzymes, structure, but not primary energy storage or membrane formation (though some proteins are in membranes, they don’t form the membrane structure or store energy as lipids do).

So lipids match the description.

Answer:

A. Lipids