Cell Theory

Cell Theory

TEKS 6.12A, 7.12F

Cell Theory

Cell Theory

• All living things are composed of cells

• Cells are the basic unit of structure and function in living things

• New cells are produced from existing cells

Scientists That Contributed

to Cell Theory

Zacharias Janssen

(Dutch)

• Lens grinder

• Created the first compound microscope by lining up 2 lenses in a tube

• Looked more like a telescope than the microscope we know today

Anton Von Leeuwenhoek

(Dutch)

• Father of microbiology

• Improved the microscope

• Discovered bacteria (called it “Animalcules”)

Robert Hooke

(British)

• Came up with the name “cells” after looking at cork under the microscope

• Thought they looked like little rooms

Matthias Schleiden

(German)

• Co-Founder of Cell Theory

• Discovered that plants are made of cells

Theodor Schwann

(German)

• Co-Founder of Cell Theory

• Discovered that animals are made of cells

• Memory Trick: Schwann = Swan = Animal

Rudolf Virchow

(German)

• Proved that all cells come from other cells

Open Ended

Explain why each statement is false, using evidence and reasoning from Cell Theory.

A one-celled organism is not a living thing.

Open Ended

Explain why each statement is false, using evidence and reasoning from Cell Theory.

The smallest living unit is the atom.

Open Ended

Explain why each statement is false, using evidence and reasoning from Cell Theory.

Viruses are not cells, but they are alive.

Open Ended

Explain why each statement is false, using evidence and reasoning from Cell Theory.

Plants do not come from cells, they come from seeds.

Multiple Choice

Which instrument is credited for helping scientists develop cell theory?

Multiple Choice

Who was the first person to view and name "cells" when he observed a cork under a microscope?

• Hooke

• Virchow

• Schleiden

Multiple Choice

Which botanist observed plants under a microscope and noticed that all plants were made of cells?

• Matthias Schleiden

• Robert Hooke

• Robert Remak

• Theodor Schwann

Multiple Choice

Which scientist first observed living cells and was later accredited for discovering bacteria?

• Robert Hooke

• Anton van Leuwehoek

• Matthias Schleiden

• Robert Remak

Multiple Choice

Which scientist observed animal cells and came to the conclusion that all animals were made of cells?

• Anton van Leuwenhoek

• Robert Hooke

• Matthias Schleiden

• Theodor Schwann

Multiple Choice

Which scientist stated that all cells come from cells after observing cell division under a microscope?

• Schwann

• Hooke

• Virchow

Multiple Choice

The Cell Theory states:

• all living things are made of two or more cells

• all living things are made of one or more cells

• all living things are not made of cells.

Multiple Choice

Another component of cell theory is...

• ...the cell is the smallest living unit in all organisms.

• ... the cell is the largest living unit in all organisms.

• ...organisms do not need cells to exist.

Multiple Choice

According to Cell Theory, all cells generate from...

• gods.

• animals.

• pre-existing cells.

The End

Now go into Google Classroom > Classwork and complete

the Cell Theory Timeline Exit Ticket