Ch. 7 cell structure and function

Life is cellular

• Important discovery in science. Revolutionized how biologist thought about living things!

• Basic structure of life

• With the invention and use of the microscope

Discovery of the cell

How did this happen?

Ch. 7 cell structure and function

Life is cellular

• Devices that produces magnified images of structure too small to see with the unaided eye

1.Compound light microscopesa. Magnifies using light rays

2.Electron microscopesb. Magnifies using beams of

electrons

Microscope

Two types of microscopes

What differences do you see?

Compound light microscope Electron microscope

Ch. 7 cell structure and function

Life is cellular

• The observations and conclusions of many scientists helped develop the current understanding of the cell.

• Using a simple compound microscope he looked at thin slices of cork

• Coined the term “cells”

History of the cell

Important Scientist!!!

Robert Hooke(1665)

HOOKE described the BOXES he saw in CORK as CELLS!

Ch. 7 cell structure and function

Life is cellular

• Observed tiny living organisms in drops of pond water

Anton van Leeuwenhoek(1674)

LEEUWENHOEK saw LIFE in WATER!!!!

Ch. 7 cell structure and function

Life is cellular

• All PLANTS are made up of cells

• All ANIMALS are made up of cells

Matthias Scheiden(1838)

Theodor Schwann

Ch. 7 cell structure and function

Life is cellular

• All cells come from pre-existing cells

RudolphVirchow

Ch. 7 cell structure and function

Life is cellular

1. Living things are made up of cells

2. Cells are the basic unit of life

3. New cells are produced from existing cells

Cell Theory(a fundamental concept of biology )

Ch. 7 cell structure and function

Life is cellular

• Prokaryotes and Eukaryotes• Determined by the lack or

presence of a nucleus

• large membrane- enclosed structure that contains the cells genetic material in the form of DNA

Two categories of cells

Nucleus

Ch. 7 cell structure and function

Life is cellular

• Do NOT have a nucleus• “Free” DNA• Single celled organisms– Ex. bacteria

• Smaller and simpler than Eukaryotes

• May have flagella or cilia for mobility

Prokaryotes

Ch. 7 cell structure and function

Life is cellular

• Have a nucleus• “bound” DNA• Larger and more complex– Ex. Plants and animals

• Contain many specialized structures known as organelles

Eukaryotes

Ch. 7 cell structure and function

Life is cellular

Ch. 7 cell structure and function

Life is cellular

Ch. 7 cell structure and function

Life is cellular