Biological Judgments. Biochemists seek to make judgments about the complex processes of maintenance and growth of which life basically consists. Biological Concepts. There are a number of essential concepts to understand to understand the logic of biology: the concept of levels of organization of life processes (at the molecular level, at the sub-cellular particle level, at the cellular level, at the organ level, and at the level of the total organism), the concept of life structures and life processes, the concept of the dynamics of life, the concept of the unity of life processes amid a diversity of life forms, etc... Biological Assumptions. Some of the key assumptions behind biological thinking are: that there are foundations to life, that these foundations can be identified, studied, described, and explained; that it is possible to use biological concepts to explain life; that it is possible to analyze and discover the structure and dynamics of living systems and their components; that all forms of life reproduce, grow, and respond to changes in the environment; that there is an intricate and often fragile relationship between all living things; that all life forms, no matter how diverse, have common characteristics: 1) they are made up of cells, enclosed by a membrane that maintains internal conditions different from their surroundings, 2) they contain DNA or RNA as the material that carries their master plan, and 3) they carry out a process, called metabolism, which involves the conversion of different forms of energy by means of which they sustain themselves.