Final answer:
Capsomers are composed of proteins, specifically small subunits called capsids. Capsids are responsible for the structure and function of the capsomers.
Step-by-step explanation:
Capsomers are composed of proteins. These proteins are made up of small subunits called capsids. Capsids are the building blocks of capsomers and are responsible for the structural integrity and function of the capsomers. They play a crucial role in the assembly and protection of the viral genome.