Final answer:
Proteomics is the large-scale, systematic study of all proteins expressed in specific conditions, providing a dynamic snapshot of a cell's proteome and aiding in disease understanding and drug development.
Step-by-step explanation:
The large-scale, systematic approach to the study of proteins that allows us to look at a snapshot of all proteins being expressed in cells under specific conditions is called proteomics. This field is an extension of genomics and provides insights into the dynamic proteome of an organism, which changes in response to various environmental conditions. Unlike the genome, which is constant, the proteome is dynamic and can provide more specific information about the state of a cell or organism. Proteomics uses various techniques such as protein microarrays and immunochemical methods to analyze protein expression patterns and interactions, thereby playing a pivotal role in understanding disease processes and developing novel pharmaceutical drugs.