Cell Biology: The First 200 Years

Question 1

What are the three tenets of cell theory?

Answer 1

1. All organisms consist of one or more cells.
2. The cell is the basic unit structure of life.
3. All cells arise only from pre-existing cells (Omnis cellula e cellula).

Question 2

What is the fourth “tenet” of cell theory?

Answer 2

Cells vary in size, shape, and function.