Question

lipids are a diverse group of biological macromolecules that include triglycerides, phospholipids, waxes, and steroids. the structure of each type of lipid impacts its function. determine whether each statement is true or false. | true | false | a gram of protein supplies more energy than a gram of fat. | | | the structure of a lipid impacts its properties. | | | lipids are mostly hydrophobic. | | |

Explanation:

Statement 1: "A gram of protein supplies more energy than a gram of fat."

Fats (lipids) provide more energy per gram (about 9 kcal/g) than proteins (about 4 kcal/g). So this statement is false.

In biology, the structure - function relationship is fundamental. The molecular structure of a lipid (e.g., saturated vs unsaturated fatty acid chains in triglycerides, the presence of phosphate groups in phospholipids) determines its physical and chemical properties such as melting point, solubility, and biological function. So this statement is true.

Lipids are composed mainly of hydrocarbon chains or rings, which are non - polar. Non - polar molecules are hydrophobic (water - fearing) because they do not interact favorably with polar water molecules. For example, triglycerides have long hydrocarbon tails in their fatty acid chains, and phospholipids have a hydrophobic tail region. So lipids are mostly hydrophobic, and this statement is true.

Answer:

False

Statement 2: "The structure of a lipid impacts its properties."