Download Ribbons of Life

Ribbons of Life
7th Grade
Investigation 4: The Cell
Diversity of Life
Organelle
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Organelles are the structures inside the
cells.
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Prokaryotic cells have a few.
Eukaryotic cells have many.
The only organelles common to all cells
are ribosomes.
All cells also have a cell membrane and
cytoplasm, or the fluid that fills the cells.
Prokaryotic and Eukaryotic
Cells
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The main difference between prokaryotic and
eukaryotic cells is the presence of a nucleus
in the eukaryotic cells.
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Prokaryotic cells do not have a nucleus.
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Bacteria are the only kinds of organisms that do not have
a nuclei in their cells.
Bacteria are prokaryotes.
All other organisms are eukaryotes.
Paramecia and Sheep Cells
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Eukaryotic
Live alone
Single-celled
organisms.
Their cells
generalize (able to
do everything for the
organism).
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Eukaryotic
Depend on complex
systems in the sheep
to keep them alive.
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Not an organism.
Their cells specialize
(they do only one
thing for the
organism).
Complex Organisms
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Cells in complex organisms often work
with other similar cells to perform
specific functions.
Masses of cells working together are
tissues.
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Examples of tissues: bone, muscle,
nerves, and endosperm (cotyledon).
Life Aquatic
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Cells are mostly water, and the environments
in which all cells live in is wet.
Organisms that have moved onto dry land
have to maintain systems that keep all their
cells surrounded by fluid.
Plants and animals transport water through
vascular systems and circulatory systems to
ensure that the aquatic environment is
provided.
Plant and Animal WaterDelivery Systems

Plant and animal water-delivery
systems also transport other essential
resources to and from the cells,
including:
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Gases
Energy
Waste