Download Introduction to Cells and the Microscope

T
H
E
CELL
Robert Hooke
Looked at cork under a “microscope”.
Saw the first cells.
Anton van Leeuwenhoek
Developed the first simple lens-based light microscope
that used a high-quality lens.
CELL THEORY
The Cell Is The Basic Unit Of Structure and Function in ALL Living Things. All Living
Things Are Made Of Cells. All Cells Come From Pre-Existing Cells.
LIGHT MICROSCOPE
• Uses light and lenses to create an image
• Maximum magnification of 1000x
• Good for general use
• Used in schools worldwide
SCANNING ELECTRON MICROSCOPE (SEM)
• Used to view details of outer
structure
• Can magnify up to 250,000x
• Bounces electrons off of the
sample to create a 3-D image
• Great for identifying small
unknown samples
TRANSMISSION ELECTRON MICROSCOPE (TEM)
• Shows internal workings of the cell
• Can magnify up to 100,000x
• Shoots electrons THROUGH the sample
to create a “map” of the insides
• Good for viewing organelles and cell
research
WHICH MICROSCOPE DO I NEED, AND WHY??
IThere’s
found
a butterfly
wing,
and
aanew
virus
making
newwhat
virus
that
is I
IThere’s
wonder
my
want
to see
what
cells
killing
people.
Ineed
want
tolook
see a
people
sick,
wethe
to
get
skin
cells
look
like.
like
that
make
it
up.
what parts
of the
cells
it infects.
better
look
at it.
LIGHT MICROSCOPE
SCANNING ELECTRON
MICROSCOPE
TRANSMISSION ELECTRON
MICROSCOPE
THE TWO MAIN CELL CLASSES:
PROKARYOTE AND EUKARYOTE
WHAT ARE THE DIFFERENCES??
IMPORTANT POINTS YOU SHOULD PROBABLY
WRITE DOWN
• Eukaryotes have a nucleus with a
membrane, Prokaryotes DO NOT.
• Eukaryotic organelles have membranes,
Prokaryotes DO NOT.
• Eukaryotes are bigger than Prokaryotes
• Eukaryotes compose most of the “big”
organisms on earth, while Prokaryotes
are usually things like bacteria.
EUKARYOTIC LIFE
ANIMAL CELLS vs PLANT CELLS
What’s The Same? What’s Different?
ANIMAL CELLS vs PLANT CELLS
ANIMAL CELLS vs PLANT CELLS
KNOW THAT:
• Animal cells and plant
cells share a lot of the same
organelles
• Plant cells have a CELL
WALL, CHLOROPLASTS,
and a CENTRAL
VACUOLE. Animal cells
DO NOT.
• Animal cells have
FLAGELLUM,
LYSOSOMES, and
CENTRIOLES, Plant cells
DO NOT.
That’s a LOT of information!! What
do I need to know??