Download 8 CELL THEORY Handouts - Hewlett

Brief History:
Van Leeuwenhooke –
- in early 1600’s used microscope to
observe pond water & saw
____________.
Hooke (1655) –
- in 1655 observed cork from a tree and
saw thousands of tiny chambers he
called “_______”.
Brown (1831) –
- saw the “_______” of a cell.
Schleiden (1838) –
- concluded all plants are made of
_____________.
Schwann (1839) –
- concluded all animals are made of
_____________.
Virchow (1855) –
- studied cell reproduction and
concluded all cells come from
____________________.
The invention of the light
microscope and these scientists
discoveries led to the development
of the cell theory…
What is the CELL THEORY?
The CELL THEORY STATES:
- All living things are _________
________________________
- Cells are the basic unit of
________________________ in
living things (cells carry out the life
processes).
- All cells come from _________
________________________
Exceptions to Cell Theory
• _________________. They cannot
reproduce without a host cell.
• Two organelles, ____________and
_______________have their own DNA
and can ________themselves.
• The first cell did not arise from a
________________________.
What is the basic structure of cells?
- from .2 µm to 50 µm in diameter.
- All cells have a…
1. __________________
2. __________________
3. __________________
4. __________________
What are the 2 CATEGORIES of
cells?
1. Prokaryotes CELLS THAT ___________
___________________
or other organelles .
They are Simpler in Structure
Ex: ____________________
Spirillum
Coccus
Bacilli
2. Eukaryotes – they contain nuclei as well as
other ____________________
that are surrounded by
_____________________.
- each organelle carries out certain
________________________..
EX: _____________, fungi, protists
Plants
Summary:
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