Question

some macromolecules are polymers. what is a polymer?
a) a long molecule that consists of repeating units
b) small molecules that act as building blocks
c) a solution that consists of many molecules
d) a group of elements in matter

Explanation:

Option b describes monomers, the building blocks of polymers, not polymers themselves. Option c refers to a solution, which is a mixture, not a single polymer molecule. Option d describes a group of elements, which is unrelated to the definition of a polymer. A polymer is specifically a large molecule made of repeating smaller units.

Answer:

a) A long molecule that consists of repeating units