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Molecular Biology in the context of Astrobiology focuses on the study of biological molecules and their interactions, particularly in the context of extraterrestrial life. It explores the structure, function, and evolution of these molecules, including nucleic acids, proteins, and carbohydrates, to understand the fundamental processes of life. This field is closely linked to Astrobiology as it provides insights into the potential building blocks of life beyond Earth and contributes to the search for extraterrestrial biosignatures. It also has ties to Astronomy, as understanding the molecular processes in celestial bodies can shed light on their formation and evolution. In essence, Molecular Biology in this hierarchy is about deciphering the molecular language of life in the universe.