• Proteins are required for cell development

1. Proteins help in forming structural components of the cell like plasma membrane, etc

• Starch is broken by an enzyme

1. Starch is a polysaccharide that is made up of amylose and amylopectin
2. Starch is broken down or hydrolyzed by an enzyme called amylase 

• When glucose levels are low, glycogen can be turned into glucose

1. Glycogen is the storage form of energy in animals
2. Glycogen is present in the liver and muscles
3. In the absence of glucose, glycogen is broken down by glycogenolysis to produce glucose

• Carbohydrates provide energy

1. Carbohydrates are the primary source of energy 
2. Glucose undergoes glycolysis to assist the cell for its metabolic activities