O. One monosaccharide that you will learn more about when we study plants is glucose. CH 2 O. Disaccharide - a double sugar composed of two simple sugars. Sucrose, common table sugar, is a combination of glucose and fructose. Polysaccharide - a complex molecule composed of three or more monosaccharides. Two polysaccharides that you will learn about this year are starch and cellulose.
Proteins are organic compounds composed of carbon, hydrogen, oxygen, and nitrogen.
The skin, muscles, and enzymes of living things are composed of proteins. Amino acids - these 20 chemicals are the monomer building blocks of proteins. Dipeptide - two amino acids bonded together. Polypeptide - a very long chain of bonded amino acids. Lipids are large organic molecules with a higher ratio of carbon and hydrogen atoms to oxygen atoms than carbohydrates.