Question

number correct 9 number incorrect 2 a single sub-unit or building block of a biological macromolecule is called a(n)... a. isomer b. monomer c. polymer d. dimer

Explanation:

To solve this, we analyze each option:

• Option A: Isomers are compounds with the same molecular formula but different structures, not building blocks of macromolecules.
• Option B: Monomers are the single sub - units or building blocks that combine to form polymers (biological macromolecules). For example, amino acids are monomers of proteins (a type of biological macromolecule).
• Option C: Polymers are large molecules made up of many monomers, so they are not the single sub - units.
• Option D: Dimers are made up of two monomers, so they are not the single building blocks.

Answer:

B. Monomer