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Molecular Biology is the branch of Physiological Chemistry concerned with the molecular mechanisms of normal biological processes, such as replication, transcription, translation, and cell division, as well as those that underlie diseases and other abnormal conditions. It involves the study of the structure, function, and regulation of molecules, including DNA, RNA, proteins, and lipids, in living organisms. Molecular Biology integrates knowledge from various fields, such as Genetics, Biochemistry, and Cell Biology, to understand how biological systems operate at the molecular level. Researchers in this field use a variety of techniques, including biochemical assays, genetic engineering, and high-throughput sequencing, to study the structure and function of molecules and their interactions within cells. Ultimately, Molecular Biology aims to provide insights into the fundamental principles that govern life, with applications in medicine, agriculture, and industry.