LIFE SCIENCE

Detailed explanation-1: -Because one triglyceride molecule yields three fatty acid molecules with as much as 16 or more carbons in each one, fat molecules yield more energy than carbohydrates and are an important source of energy for the human body.

Detailed explanation-2: -Because lipids include a high percentage of C-H bonds, which store chemical potential energy more effectively than other molecules, fats have a substantially higher energy density than carbohydrates. Hence, fats contain more energy per gram than carbohydrates.

Detailed explanation-3: - Lipids have more carbon-hydrogen bonds than carbohydrates, thus contain more energy per gram than carbohydrates or proteins, which explains why fats have a greater caloric value.

Detailed explanation-4: -Each fatty acid molecule produces many acetyl CoA molecules (whereas glucose yields two), so much more ATP can be generated from a single fatty acid molecule than one glucose molecule.

Detailed explanation-5: -Lipids have a higher caloric value per gram than carbohydrates or proteins because their molecules have more hydrogen atoms to remove. More hydrogen atoms equal more energy.