Cytology, the scientific study of cells, was born in 1663 when observed the empty cell walls of cork and coined the word cellulae (“little cells”) to describe them (see section 1.2).

Soon he studied thin slices of fresh wood and saw living cells “filled with juices”—a fluid later named cytoplasm.

By the mid-1800s, with increasingly sophisticated instruments and methods of observation, scientists arrived at certain generalizations about cells that we now call the cell theory.

This is credited especially to German physician–physiologist Theodor Schwann (1810–82) and German botanist Matthias Schleiden (1804–81).

Although stated in various ways, the most essential points of the cell theory are (Part 1)

All living organisms are made of one or more cells. Cells are the basic structural and functional units of all living organisms. Nothing simpler than a cell, such as an organelle, DNA, or an enzyme, is alive in itself.

Although stated in various ways, the most essential points of the cell theory are (Part 2)

All activities of an organism (including the human body) stem from the activities of its constituent cells. Cytology is therefore the foundation for all biological understanding of life.

Although stated in various ways, the most essential points of the cell theory are (Part 3)

All cells arise from preexisting cells, not from nonliving matter, and they pass hereditary information from generation to generation of cells.

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3.1a

Question	Answer
Robert Hooke	Cytology, the scientific study of cells, was born in 1663 when observed the empty cell walls of cork and coined the word cellulae (“little cells”) to describe them (see section 1.2).
Robert Hooke	Soon he studied thin slices of fresh wood and saw living cells “filled with juices”—a fluid later named cytoplasm.
By the mid-1800s, with increasingly sophisticated instruments and methods of observation, scientists arrived at certain generalizations about cells that we now call the cell theory.	This is credited especially to German physician–physiologist Theodor Schwann (1810–82) and German botanist Matthias Schleiden (1804–81).
Although stated in various ways, the most essential points of the cell theory are (Part 1)	All living organisms are made of one or more cells. Cells are the basic structural and functional units of all living organisms. Nothing simpler than a cell, such as an organelle, DNA, or an enzyme, is alive in itself.
Although stated in various ways, the most essential points of the cell theory are (Part 2)	All activities of an organism (including the human body) stem from the activities of its constituent cells. Cytology is therefore the foundation for all biological understanding of life.
Although stated in various ways, the most essential points of the cell theory are (Part 3)	All cells arise from preexisting cells, not from nonliving matter, and they pass hereditary information from generation to generation of cells.

Created by: Russells3709

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