A Level Biology Practice Exam

Which of the following best describes monomers?

1. They are complex molecules made of proteins

2. They are individual molecules that combine to form polymers

3. They are large structures made of multiple polymers

4. They refer to the chemical bonds within a single polymer

The correct answer is: They are individual molecules that combine to form polymers

Monomers are the basic building blocks of more complex molecules known as polymers. This statement is accurate because monomers are simple molecules that can link together through chemical reactions, such as condensation or dehydration synthesis, to form larger, more complex structures. For example, glucose is a monomer that can combine to form polysaccharides such as starch or cellulose. In the context of this question, the other options do not accurately reflect the definition of monomers. Complex molecules made of proteins relate more to proteins themselves, not their constituent parts. Large structures made of multiple polymers describe a higher order of organization rather than the individual components of those structures. The reference to chemical bonds within a single polymer pertains to the interactions between monomers, but does not define what monomers are. Thus, the correct focus on monomers as individual molecules that combine to form polymers is fundamental to understanding biochemical structures.