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date: 14 July 2024

2. p. 29Living Cellslocked

2. p. 29Living Cellslocked

  • Trudy McKee
  •  and James R. McKee


This chapter talks about cells, which are the structural units of all living organisms. The human body represents a remarkable illustration of the diversity of cells as it contains about 200 types. This great variation reflects the variety of functions that cells can perform. However, no matter what their shape, size, or species, cells are also amazingly similar. The chapter shows how cells are surrounded by a membrane that separates them from their environment. It explains that they are composed of the same types of molecules. The chapter reviews the structural hierarchy of life on earth and argues that it extends from the biosphere to biomolecules. Cells are considered the basic unit of life, since they are the smallest entities that are actually alive.

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