Final answer:
In DNA comparison, we specifically look at the sequence of nitrogen bases, which include adenine, cytosine, guanine, and thymine. Amino acids, however, are not part of the DNA structure but are instead the components of proteins.
Step-by-step explanation:
When comparing DNA, we look at the sequence of nitrogen bases. These bases are adenine (A), cytosine (C), guanine (G), and thymine (T) in DNA. They form complementary base pairs with adenine pairing with thymine and cytosine with guanine. The hydrogen bonds between these bases are what hold the two strands of DNA together, where A and T share two hydrogen bonds, and C and G share three. Phosphodiester bonds, on the other hand, are found within the sugar-phosphate backbone and do not break during complementary base pairing.
One of the things that is not found within DNA is amino acids because DNA consists of nucleotides, not amino acids. Amino acids are the building blocks of proteins, and while DNA contains the instructions for making proteins, it does not contain the proteins themselves.