TOPIC: CellsAIM: Explain the cell theory and the

scientists how helped develop it.Do Now:

A new idea that is tested in a scientific experiment is known as a(an) _______.

HW: Read pgs 38-44. Define New Vocabulary words on text page 38.

•Carry out life processes•Make up living things

Cells

Just like bricks make up a brick house, cells make up

a living thing.

The Cell Theory – a timelineRobert Hooke ( 1665)

• Used light microscope to look at thin slices of plant tissues -- cork

• Looked empty, like monk’s chamber

• Called tiny chambers

“cells”

• Used light microscope to look at thin slices of plant tissues -- cork • Looked empty, like monk’s chamber• Called tiny chambers “cells”

• Leeuwenhoek

• First to view pond water organisms

• First to see living microscopic orgs

• Made careful sketches

Matthias Schleiden 1838

• German Botanist (plants)

• All plants looked at were made of cells, so concluded:

“All plants are

made of cells.”

Theodore Schwann -- 1839

• German scientist who studied animals -- zoologist

• Saw that all animals he studied were cellular so concluded:

“All animals are made of cells.”

Rudolf Virchow -- 1855• German physician

who studied cell reproduction

• “Where a cell exists, there must have been a preexisting cell…..”

1. Cells are the basic unit of structure in all living things.

(Living things are made of cells)

Cell Theory

2. Cells are the basic unit of function of all living things

(They carry out life processes)

3. All cells come from pre-existing cells.

• Viruses:

- not composed of cellsnot composed of cells

- contain genetic informationcontain genetic information

- reproduce inside host cellreproduce inside host cell

Exceptions to the Cell Theory

Virus do not

reproduce by division because they are not cells.

Did you know…

• The common cold is a type of virus.

• Viruses can be treated with antiviral drugs.

• The first virus was found in both plants and animals 100 years ago.

Let’s summarize…

1. What are cell organelles?

2. Explain the three parts of the cell theory.

3. Explain why viruses are exceptions to the cell theory.

1. Which statement is not a part of the cell theory?

1. Cells are the basic unit of structure of living things.

2. Cells are the basic unit of function of living things.

3. Cell parts such as chloroplasts are self-replicating.

4. Cells come from preexisting cells.

2. The cell theory states that all living things are made up of

1. organisms

2. cells

3. tissues

4. proteins

3. Which choice is NOT part of cell theory?

1. Cells are the basic units of life.

2. All living things are made of one or more cells.

3. All cells come from other living cells.

4. New cells have the same nuclei as those of pre-existing cells.

4. The name “cells” was a result of the observations made by

1. Robert Virchow 2. Theodor Schwann

3. Robert Hooke 4. Matthias Schleidan

5. Part if the cell theory that states that all cells come pre-existing cell was a result of

1. Robert Virchow 2. Theodor Schwann

3. Robert Hooke 4. Matthias Schleidan

6. The man who observed many different types of plant tissues and concluded that all plants are made up of cells is

1. Anton van Leeuwenhoek

2. Theodor Schwann

3. Robert Hooke

4. Matthias Schleidan

7. The man who observed many different types of animal tissues and concluded that all plants are made up of cells is

1. Anton van Leeuwenhoek

2. Theodor Schwann

3. Robert Hooke

4. Matthias Schleidan