Cell theory

And types of cells

Levels of organization

Levels of organization Cell -- basic unit of life (Ex. blood cell, nerve cell, Collenchyma cells(plants))

○ Different types of cells have different jobs, this is called Cell Specialization

Tissue -- group of cells that perform a particular function

Organ -- groups of different tissues that work together (Ex. Heart, brain, skin)

Organ system -- a group of organs working together to perform a specific function

(Ex. Digestive tract)

Organism -- entire living thing that carries out all the basic life functions

Discovery of the Cell ● Anton van Leeuwenhoek● First described living cells as

seen through a simple

microscope

● 1600’s

Discovery of the Cell ● Discovered by Robert

Hooke ● He looked at a piece of cork

in a microscope and noticed

“tiny, empty chambers”.

● He called them “cells”.

● Used a compound

microscope

Discovery of the Cell ● Mathias Scleiden identified

the first plant cells and

concluded that all plants are

made of cells.

● Thomas Schwann made the

same conclusion about

animal cells

Cell Theory

1) All living

things are

made up of

one or more

cells and their

products

Cell Theory

2) The cell is the

simplest unit of

structure and

organization in

organisms.

Cell Theory

3) All cells come

from other cells;

they do not come

from non-living

matter.

Classification of Cells

Who doesn’t love a Venn Diagram?!

Page 172 in your textbooks may be of some assistance!

Prokaryotic vs Eukaryotic

Pg. 172

Prokaryotic Cells

● Simple, unicellular organisms (e.g. archaea and bacteria)

● No cell nucleus ● No membrane-bound

organelles

Eukaryotic Cells● Larger than prokaryotic

cells ● Contain a nucleus and

membrane-bound organelles

● Includes protists, fungi, animals, and plants

Single-Celled Eukaryotes

Multi-cellular Eukaryotes