The nucleic acid is therefore a collective term from chemistry for RNA and DNA. Similarly, these nucleic acids form carbohydrates, proteins and lipids. The lipids are used in your body, among other things as an energy store and a so-called signaling molecule. That is, it is important for the signal transmission, or transmission. For this purpose, cells are needed which are responsive to the external stimuli. These are then converted and transferred into the cell interior. Through this process, your body may react for example to environmental changes.