• First, we introduced the basic concept of an organism and the basic structure of living things
  • Living things have basic properties that distinguish them from non-living things. These properties include membrane structure, proliferation, heredity, morphogenesis, metabolism, homeostasis, and environmental response.
  • The basic unit of membrane-bound organisms is the cell, and all organisms are composed of cells.
  • Prokaryotes and eukaryotes are distinguished from one another on the basis of their intracellular structure.
  • Various organisms, such as unicellular and multicellular as well as animals and plants, exist in nature.
  • The world of living things involves a hierarchy including molecules, cells, multicellular organisms, and biotic populations. There are some principles for each level of hierarchy. By understanding this hierarchy, we can understand the general principles of life.
  • Classification of organisms is useful for organizing biological phenomena. Furthermore, whether we can learn something by classifying organisms in a certain manner is more important than whether a classification method is correct.
  • Although microorganisms are unicellular organisms strongly associated with human life, their diversity in nature is extremely high.

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