LIFE SCIENCE

Detailed explanation-1: -Explanation: There are four classes of biological molecules: fats, carbohydrates, proteins, and nucleic acids. Of these, fats produce the most energy per gram at a whopping nine calories per gram.

Detailed explanation-2: -Lipids are a class of macromolecules that are nonpolar and hydrophobic in nature. Major types include fats and oils, waxes, phospholipids, and steroids.

Detailed explanation-3: -Lipids are oily or greasy nonpolar molecules, stored in the adipose tissue of the body. Lipids are a heterogeneous group of compounds, mainly composed of hydrocarbon chains. Lipids are energy-rich organic molecules, which provide energy for different life processes.

Detailed explanation-4: - Organic molecules with a basic structure composed of carbon, hydrogen, and oxygen that often bond to form fatty acids and glycerols. 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.