The discovery of cells notes

1. Leeuwenhoek & Hooke

2. Cell Theory

3. Two Types of Cells

4. Eukaryotes

1. Animals Cells: organelles

2. Plant Cells: organelles

5. Cellular Organization

1. Plasma Membrane: structure & selective permeability

2. Diffusion (examples, concentration gradients, lab)

3. Osmosis (iso, hypo, hyper tonic solution)

The Discovery of Cells…1. Development of

microscopes allowed for scientists to look closely and discover cells.

Head of a needle… covered in bacteria

The Discovery of Cells…2. 1600’s - Anthony van Leeuwenhoek, Robert Hooke, and many others viewed cells using microscopes and drew hundreds of examples.

Hooke named what he saw “cells” after the small rooms monks lived in.

The Discovery of Cells…4. Cell Theory – 3 parts1. All living things are

made up of one or more cells.

2. In organisms cells are the basic unit of structure and function.

3. Cells come from existing cells.

This collective study led to the CELL THEORY.

3. Their work led other scientists to study cells.

The Discovery of Cells5. All cells have…

a) Plasma membrane

d) Cytoplasm (semi fluid substance)

b)Ribosomes (make proteins)

c) Chromosomes (genetic information,

DNA)

The Discovery of Cells

Prokaryotes

Eukaryotes

6. Two types of cells

The Discovery of Cells…

A. PROKARYOTES:

ALL BACTERIA

• Mostly single-celled organisms (unicellular).

• “Pro” = before (nucleus)

•Size: 1-10 microns (1000 microns in a millimeter)

•No nucleus or internal compartments (organelles).

The Discovery of Cells…B. EUKARYOTES

• Mostly multicellular organisms.

• “Eu” = true (with nucleus)

• Size: 10-100 microns

• Nucleus and many, specialized, internal compartments (organelles).

The Discovery of Cells…

Prokaryotes Eukaryotes

• Mostly single-celled organisms (unicellular).

• Mostly multicellular organisms.

• “Pro” = before (nucleus)

• “Eu” = true (with nucleus)

• Size: 1-10 microns • Size: 10-100 microns

• No nucleus or internal compartments

(organelles).

• Nucleus and many, specialized, internal compartments (organelles).

• Mostly bacteria • everything else (you)