What are the four categories of biochemical molecules of the human body?
The four categories of biochemical molecules in the human body are carbohydrates, lipids, proteins, and nucleic acids.
Carbohydrates are organic compounds made of C, H, and O atoms. They consist of monosaccharides (single sugars) linked together. Examples are starch, glycogen, and cellulose.
Lipids are nonpolar molecules that are not soluble in water. Examples are cholesterol, triglycerides, and phospholipids.
Proteins are chains of amino acids. The most abundant protein in the blood is albumin, which is also the chief protein of egg whites.
Nucleic acids are long chains of smaller molecules called nucleotides. Examples are RNA and DNA.