Download Ch. 7 cell structure and function Life is cellular

Ch. 7 cell structure and
function
Life is cellular
Discovery of
the cell
• Important discovery in science.
Revolutionized how biologist
thought about living things!
• Basic structure of life
How did this
happen?
• With the invention and use
of the microscope
Ch. 7 cell structure
and function
Life is cellular
Microscope
Two types of
microscopes
• Devices that produces
magnified images of structure
too small to see with the
unaided eye
1. Compound light microscopes
a. Magnifies using light rays
2. Electron microscopes
b. Magnifies using beams of
electrons
What differences do you see?
Compound light microscope
Electron microscope
Ch. 7 cell structure
and function
Life is cellular
History of the
cell
• The observations and conclusions of
many scientists helped develop the
current understanding of the cell.
Important
Scientist!!!
Robert Hooke
(1665)
• Using a simple compound microscope
he looked at thin slices of cork
• Coined the term “cells”
HOOKE described the BOXES he saw in CORK as CELLS!
Ch. 7 cell structure
and function
Life is cellular
Anton van
Leeuwenhoek
(1674)
• Observed tiny living
organisms in drops of pond
water
LEEUWENHOEK
saw LIFE in
WATER!!!!
Ch. 7 cell structure
and function
Life is cellular
Matthias
Scheiden
(1838)
Theodor
Schwann
• All PLANTS are made up of
cells
• All ANIMALS are made up of
cells
Ch. 7 cell structure
and function
Life is cellular
Rudolph
Virchow
• All cells come from preexisting cells
Ch. 7 cell structure
and function
Life is cellular
Cell Theory
(a fundamental
concept of biology )
1. Living things are made up of
cells
2. Cells are the basic unit of
life
3. New cells are produced
from existing cells
Ch. 7 cell structure
and function
Life is cellular
Two
categories of
cells
• Prokaryotes and Eukaryotes
• Determined by the lack or
presence of a nucleus
Nucleus
• large membrane- enclosed
structure that contains the
cells genetic material in the
form of DNA
Ch. 7 cell structure
and function
Life is cellular
Prokaryotes
• Do NOT have a nucleus
• “Free” DNA
• Single celled organisms
– Ex. bacteria
• Smaller and simpler than
Eukaryotes
• May have flagella or cilia for
mobility
Ch. 7 cell structure
and function
Life is cellular
Eukaryotes
• Have a nucleus
• “bound” DNA
• Larger and more complex
– Ex. Plants and animals
• Contain many specialized
structures known as
organelles
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