Transcript History of Cell Discovery

History of Cell Discovery
Chapter 4
Microscope view of cells
► Robert
Hooke – first to see cells
 designed microscope that he was
able to view cork cells with (1665).
►Named “Cells” because
they look like monk quarters
Cells with stone beds
Microscope view of cells
Anton Van Leeuwenhoek – first to see living
cells.
► improved design, and was
able to view red blood cells
and bacteria.
 Called them "animalicules"
Scientists of Cell Theory
► Theodore
Schwann – zoologist who
observed that the tissues of animals had
cells (1839)
Scientists of Cell Theory
► Mattias
Schleiden – botanist who observed
that the tissues of plants had cells (1845)
Scientists of Cell Theory
► Rudolf
Virchow – reported that every living
thing is made up of cells, and that these
cells must come from other cells.
Cell Theory
1.
All living things are made of one or more
cells.
2. Cells are the basic unit of structure and
function in organisms.

(the smallest unit that can perform life
functions)
3. All cells come from pre - existing cells.
Terms
► Cell
– the smallest unit that can
carry on the processes of life.
► Unicellular
cell
– consists of only one
► Multicellular
– consists of more
than one cell
Basic cell Structures
► Cell
Membrane –
outer boundary
► Nucleus – control
center
► Cytoplasm – stuff
between membrane
& nucleus
Two Basic Cell Types
►Prokaryotic
– lacks internal organelles
surrounded by membranes
 Has a cell membrane & a cell wall
 Has NO nucleus.
►Means
“before the nucleus”
 Usually Unicellular organisms
 Ex: Bacteria
Why should we care about prokaryotes?
► Benefits
prokaryotes (bacteria) provide:
Bacteria in your stomach aid in digestion
Provide immunity
Break down waste
Food production (dairy products and anything
fermented)
 Used in production of medicine (i.e. insulin)
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► You
have 1 trillion cells in your body. There
are 10 trillion bacterial cells living on/in your
body
► 100 times more bacterial DNA on us or in us
affecting us than our own DNA (so we're
basically 99% bacteria).
Two Basic Cell Types
►Eukaryotic
– contains internal
membrane bound organelles.
 Has a nucleus
 Has a cell membrane
 Usually multicellular organisms
 Ex: Plants, animals, and protists