Cells & The Cell Theory

The first part of the cell theory is that --

• Sometimes organisms are composed of one or more cells.

• ALL organisms are composed of one or more cells.

Second part of the cell theory is that --

• the cell is the basic unit of structure and organization/life

• the cell is a nonliving unit

The third part of the cell theory is

• We have to make new cells on our own in a lab

• Cells come from pre-existing cells

What did Leeuwenhoek discover when using the microscope that he built? 

• A butterfly.

• Onions.

• The bacteria on his teeth.

Robert Hooke discovered the ____ when looking at a cork underneath a microscope because they looked like chambers/small rooms.

• cell theory

• cell

• bacteria

Matthias Schleiden, a botanist, contributed to the cell theory when he discovered that every plant he looked at was --

• made of molecules

• had protons and neutrons

• was made of cells

While studying animals, Theodore Schwann discovered that --

• you could eat animals

• animals were made of cells

• he did not contribute to a cell theory part

According to Virchow, where do cells actually come from? 

• From pre-existing cells

• They pop up out of nowhere.

True or False

The cell theory is:

1. All living things are composed of cells.

2. Cells are the basic units of structure and function in living things.

3. All cells are produced from other cells.

• True

• False