Download Chapter 6 notes part one

Cell Theory
The CELL THEORY states:
all organisms are composed of
similar units of organization,
called cells.
The concept was formally written
in 1839 by Schleiden & Schwann
and remains as the foundation of
modern biology.
Cell Theory
1. All known living things are made up
of cells.
2. The cell is structural & functional
unit of all living things.
3. All cells come from pre-existing
cells by division.
4. Cells contains hereditary information
which is passed from cell to cell
during cell division.
5. All cells are basically the same in
chemical composition.
6. All energy flow (metabolism & biochemistry) of
life occurs within cells.
Robert Hooke
In 1663 an English scientist, Robert
Hooke, discovered cells in a piece of
cork, which he examined under his
primitive microscope.
Hooke only observed cell walls
because cork cells are dead and
without cytoplasmic contents.
Hooke drew the cells he saw and also
coined the word CELL.
Anton van Leeuwenhoek
Ten years later
Anton van Leeuwenhoek (1632-1723),
a Dutch businessman used his own
(single lens) monocular microscopes
and was the first person to observe
bacteria and protozoa
The Difference Between Plant
and Animal Cells
Animal Cells
• Can not make their own food so they have to
eat food
• Do not go through photosynthesis
• Animal cells are more round shaped
• Animal cells have lysosomes
• Animal cells can not make sugar
• Animal cells use mitochondria to release
energy
Animal cells cont.
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Animal cells do not have a cell wall
We are all made of animal cells
Animal cells do not have a large vacuole
They do not have chloroplast
Similarities of Animal and Plant Cells
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They both have a nucleus
They both have ribosome's that make protein
Animal and plant cells both have Golgi bodies
They both have cytoplasm
They both have vacuoles that store food,
water and waste products.
Plant Cells
• Plant cells have a cell wall
• Plant cells have a large vacuole unlike the
animal cell
• Plant cells do not have mitochondria
• They also do not have lysosome’s
• Plant cells are in the shape of a rectangle
• Plant cells go through photosynthesis
Plant Cells cont.
• Plant cells have chloroplast
• Plant cells use chloroplast to store energy
• They also have cell membranes