The generation of metabolic energy is a major activity of all cells, and two cytoplasmic organelles are specifically devoted to energy metabolism and the production of ATP. Mitochondria are responsible for generating most of the useful energy from the breakdown of lipids and carbohydrates, and chloroplasts
1 Cell communication and what is cell signaling 2. Some of the basic characteristics of cell signaling systems 3. Main classes of cell-surface receptor proteins for secreted