Final answer:
The question concerns the identification of a molecular type without a provided structure. Main components of myelin are lipids and proteins, C6H12O6 is a hexose monosaccharide, and nucleic acids are composed of nucleotides.
Step-by-step explanation:
The question relates to the identification of a type of molecule, but no structure is provided. In absence of a structure or molecular description, it is impossible to determine the molecule type from the options given: amino acid, lipid, carbohydrate, or nucleic acid. However, we can discuss the main components of myelin, which are lipids and proteins. Additionally, C6H12O6 is recognized as a hexose monosaccharide, an example of a carbohydrate molecule. The building blocks of nucleic acids are nucleotides, and not sugars, nitrogenous bases, or peptides individually. Furthermore, cellulose and starch are types of polysaccharides. Cholesterol is specifically classified as a steroid, which is a subgroup of lipids.