Unit 3 Notes: Introduction to the Cell

Unit 3 Notes: Introduction to the Cell

• Cell:______

• Discovery of the cell

A. 1665 by English scientist ______

• Cell Theory

A. Robert Hooke looked at thin slices of ______under a ______.

1. Hooke used the term ______to describe the empty spaces in cork

(named after ______).

2. Hooke actually observed the remains of dead plant cells.

B. The first person to observe living cells was Anton van Leeuwenhoek, a Dutch ______, in 1673.

C. Major ideas of the cell theory:

1. All living things are ______.

1. Cells are the ______).

3. All cells ______.

D. Evidence for the cell theory from German scientists:

1. Matthias Schleiden, 1838: ______.

2. Theodor Schwann, 1839: ______.

3. Rudolf Virchow, 1855: ______.

• Cell Diversity: Not all cells are ______! Cells differ in ______. However, they are all made of the same basic chemical elements: ___, ___, ___, ___, ___, and ___.

A. Size

1. Large: ______(up to 2m!)

2. Small: ______(very tiny!)

3. Most cells are ______.

1. Why are cells so small? They are limited in size by ______

______. ______, ______, and other materials must enter the cell through its ______. As a cell grows ______its surface area becomes ______to allow these materials to ______quickly enough to meet the cell’s needs.

What happens if cells are too big?

______!

Why is this a problem?

______.

• Cell:______

• Discovery of the cell

A. 1665 by English scientist ______

• Cell Theory

A. Robert Hooke looked at thin slices of ______under a ______.

1. Hooke used the term ______to describe the empty spaces in cork

(named after ______).

2. Hooke actually observed the remains of dead plant cells.

B. The first person to observe living cells was Anton van Leeuwenhoek, a Dutch ______, in 1673.

C. Major ideas of the cell theory:

1. All living things are ______.

1. Cells are the ______).

3. All cells ______.

D. Evidence for the cell theory from German scientists:

1. Matthias Schleiden, 1838: ______.

2. Theodor Schwann, 1839: ______.

3. Rudolf Virchow, 1855: ______.

• Cell Diversity: Not all cells are ______! Cells differ in ______. However, they are all made of the same basic chemical elements: ___, ___, ___, ___, ___, and ___.

A. Size

1. Large: ______(up to 2m!)

2. Small: ______(very tiny!)

3. Most cells are ______.

1. Why are cells so small? They are limited in size by ______

______. ______, ______, and other materials must enter the cell through its ______. As a cell grows ______its surface area becomes ______to allow these materials to ______quickly enough to meet the cell’s needs.

What happens if cells are too big?

______!

Why is this a problem?

______.