Final Answer:
Proteomic analysis is a methodology that deals with a) Protein structure.
Step-by-step explanation:
Proteomic analysis is a scientific approach focused on the study of proteins within a biological system. It involves the identification, quantification, and characterization of proteins present in cells, tissues, or organisms.
This methodology primarily delves into understanding the structure, function, and interactions of proteins. Unlike amino acid composition, nucleic acid sequencing, or lipid profiling, which focus on other molecular components, proteomic analysis specifically targets proteins, providing valuable insights into various biological processes.
Therefore, the correct choice is a) Protein structure.