Polymer chains in DNA are formed from which type of monomers?

The correct answer is nucleotides because they are the fundamental building blocks of DNA. Each nucleotide consists of three components: a phosphate group, a deoxyribose sugar, and a nitrogenous base (adenine, thymine, cytosine, or guanine). These nucleotides link together through covalent bonds between the phosphate group of one nucleotide and the sugar of the next, forming long chains that create the backbone of the DNA structure. This unique arrangement allows for the storage of genetic information and contributes to the double helix formation of DNA, where two strands of nucleotides pair through complementary base pairing.

In contrast, amino acids are the monomers that make up proteins, glucose is a simple sugar that serves as an energy source and is the building block for polysaccharides, while fatty acids are components of lipids. Each of these other types of monomers serves distinct biological functions but does not contribute to the formation of DNA polymer chains. Understanding the role of nucleotides in DNA is crucial for grasping concepts related to genetics, heredity, and molecular biology.