the discovery of cells section 7.1 in your textbook important questions: what are cells? who...

The Discovery of Cells

Section 7.1 in your textbook

Important Questions:What are cells? Who discovered them? How can we view parts of cells? What is inside of cells?

COMMON CELL TRAITS

A cell is the smallest unit that is capable of performing life functions.

What happens in a cell to carry out life functions?

This video clip animates what happens in the cells. We will talk about some of these processes during the rest of our cell unit.

This clip is complicated…but just watch and appreciate the dynamic processes that occur in cells!

COMPARING CELLS

The size & shape of a cell relates to its function. (job it does)

Cellular Organization

Cells tissue organs organ systems organism

One or many cells

Some organisms are single celled = unicellular

Some organisms are made of many cells = multicellular

Cell Theory

All organisms are made up of 1 or more cells

The cell is the basic unit of organization

All cells came from preexisting cells

Who discovered cells? Who created the cell theory?

Important Biologists in the Discovery of Cells– Anton Van Leeuwenhoek (1600’s)– Robert Hooke (1600’s)– Matthias Schleiden (1830’s)– Theodore Schwann (1830’s)

Prokaryotic Cells(proh KAYR ee yah tihk)

cells without membrane-bound structures

EX: bacteria

pond scum

Eukaryotic Cells(yew KAYR ee yah tihk)

cells with membrane-bound structures

EX: animals, plants, fungi and protists

The cell theory was created by…

Observing cells and organisms Today we have many types of microscopes

we can use to view cells We will use the compound light microscope

in this unit to view cells

Let’s review how to use the microscope!