Make a table to summarize the contributions made to the cell theory by Robert Hooke, Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.

Draw a cell nucleus. Label and give the function of the following structures: chromatin, nucleolus, and nuclear envelope.

Discuss the roles of Schleiden, Schwann, and Virchow in the development of the cell theory.

Describe the major contributions of Hooke and Leeuwenhoek to cell biology.

List the three main ideas of the cell theory.

A substance that moves across a cell membrane without using the cell's energy tends to move a. away from the area of equilibrium. b. away from the area where it is less concentrated c. away from the area where it is more concentrated. d. toward the area where it is more concentrated.