Final answer:
Carbon is crucial in forming macromolecules of life, such as proteins, nucleic acids, carbohydrates, and lipids. These macromolecules are composed of carbon atoms and play essential roles in various cellular processes.
Step-by-step explanation:
Carbon is an essential element in forming macromolecules of life because it can form covalent bonds with up to four different atoms, making it versatile as a structural component. Many complex molecules in cells, such as proteins, nucleic acids (RNA and DNA), carbohydrates, and lipids, are macromolecules made up of carbon atoms. For example, proteins are composed of amino acids, which contain carbon and other atoms. Carbohydrates, such as glucose, are carbon-based compounds that serve as a source of energy in living organisms. Lipids, such as fats and oils, are also carbon-rich molecules that play important roles in energy storage and cell membranes.