Question

Select the true statements.
Walnuts, salmon, and butter are dietary sources of lipids.
Lipids are used to build cell membranes.
Lipids are used for quick-acting, short-term energy in cells.
Steroids are a type of lipid.

Answer 1

True statements: 1, 2, and 4.

- Walnuts, salmon, and butter are dietary sources of lipids (they contain fats/oils).
- Lipids (phospholipids, cholesterol) are key components of cell membranes.
- Steroids (e.g., cholesterol, steroid hormones) are a class of lipids.

Statement 3 is false: lipids provide dense, long-term energy storage and are metabolized more slowly; carbohydrates are the main quick-acting short-term energy source.