Which set correctly states the three classic tenets of cell theory in the history of cell biology?

• A. All cells contain a nucleus; all cells arise spontaneously from nonliving matter; the cell membrane is the basic unit of life.
• B. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in living things; all cells arise from pre-existing cells.
• C. All organisms are made of tissues; tissues are the basic unit of structure and function; tissues arise from pre-existing tissues.
• D. All living organisms are composed of cells; all cells carry DNA; all cells are produced by mitosis.

Answer: (B)