Carbohydrates: Energy is stored in chemical bonds and released during cellular respiration, Simple form called glucose is the most important source of energy in organisms, Main components of the cell walls of plant and fungi cells, Provide energy storage in the form of starch in plants and glycogen in animals, Lipids: Some types are triglycerides and provide energy storage and thermal insulation in the form of fats and oils, Some types are phospholipids and are a major component of cell membranes, Cholesterols are important components of the cell membrane and give it flexibility and fluidity, Proteins : Some types regulate body metabolism, growth and gene expression (insulin, growth hormones, polymerase), Enzymes such as amylase or lipase are catalysts and speed up chemical reactions, Some are transporters and carry substances across cell membranes, Some are contractile and move muscles, Nucleic Acids: Directs synthesis of protein, Stores genetic information in its sequence of nitrogen bases, Transmits heredity information,

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