Carbohydrates
Lipids
Proteins
Nucleic acids
Never used for energy
First energy source for organism
Secondary energy source for organisms.Storage form of energy
Usually not used for energy. However, if the organism is not getting enough energy from other nutrients they are used for energy
Biomolecules such as carbohydrates, lipids, proteins, and nucleic acids can all be used as energy sources by organisms. Carbohydrates are the primary source of energy for most organisms, as they can be easily broken down into glucose, which is then used for cellular respiration to produce ATP. Lipids are a secondary source of energy and are usually stored in adipose tissue as a long-term energy reserve. Proteins can also be used as an energy source, but they are typically only used if the organism is not getting enough energy from carbohydrates or lipids. Nucleic acids, such as DNA and RNA, are not typically used as an energy source, but can be broken down and their components can be used for energy production in certain conditions.
