Final answer:
Starch and cellulose are composed of the same monomers, which are glucose units, making them both polysaccharides. Proteins, DNA, RNA, cholesterol, and sucrose are formed from other types of monomers.
Step-by-step explanation:
The answer to the question 'Which of the following are composed of the same monomers?' is c. starch and cellulose. Both starch and cellulose are polysaccharides, polymers that are composed of glucose monomers. While their structure and the bonds linking the glucose monomers differ—starch has α-glycosidic bonds and cellulose has β-glycosidic bonds—the basic monomer unit is glucose in both cases.
Contrastingly, proteins are made of amino acids, not glucose, categorizing them as a completely different type of polymer. Likewise, DNA and RNA are built from nucleotide monomers, which are distinct from the glucose monomers that compose starch and cellulose. Additionally, cholesterol is a lipid, and sucrose is a disaccharide, thus neither starch nor cellulose share monomers with these substances.