Proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.

Amino acids are not part of evolutionary theory. Evolution is the change in allele frequency over time in a population of organisms. The theory of evolution by natural selection explains much of the mechanism for evolution. Alleles are different molecular forms of the same gene. This means different alleles could code for the manufacturing of different proteins, or proteins with different functions. Proteins are made of amino acids, which is as close as amino acids get to the theory of evolution. If it were some other molecule then the theory of evolution would still be explaining much the same thing.

Andrew. Ferguson has written:

'Biochemical systematics and evolution' -- subject(s): Biochemistry, Chemotaxonomy, Molecular evolution, Evolution, Evolution (Biology)

'Punctured'

'An electrophoretic study of the blood and egg white proteins of some Columbidae'

'Scotland's opportunity'

Organisms don't evolve , species do.

Also - many proteins are enzymes, and their manufactured as directed by DNA.

A change in DNA may or may not lead to changes which can be described as evolution.

Proteins are made up of amino acids arranged in complicated patterns. Like the genomes that direct their synthesis, they follow a pattern of nested hierarchies, supporting common descent.