Fats are a type of lipid that are generally soluble in organic solvents and generally insoluble in water. Which of the following questions will best guide the researchers to determine if a substance is a fat?

(A) At what temperature does the substance boil?

(B) What type of mixture does the substance form when mixed with water?

(C) Does treating the substance with acid affect its appearance?

(D) Have chemical reactions been recorded between the substance and other chemicals?

There are four major types of macromolecules, and each type has specific functions and characteristics. Proteins are made of amino acids and function as enzymes, receptors, hormones, signals, and receptors. Lipids are made of fatty acids and glycerol and function as membrane components and energy storage. Carbohydrates are made of monosaccharides and function as energy storage. Nucleic acids are made of nucleotides and provide genetic information for organisms.