Transcript The Cell

Day 21
What are prokaryotes?
Prokaryotes are single-celled organisms
that do not have a nucleus or other
membrane-bound organelles.
What are eukaryotes?
Eukaryotes can be single-celled or
multicellular, but they all have a nucleus
and other membrane-bound organelles.
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Plant & Animal Cells
Contrasting Case Activity 4b
Investigation 4 – The Cell
Plants & Animals
Are plants and animals prokaryotes or
eukaryotes?
eukaryotes
What does that mean about their cells?
Every cell of a eukaryote has a
nucleus and other membrane-bound
organelles.
Organelles
All cells are filled with a fluid called cytoplasm.
Floating in this fluid are structures called
organelles.
There are different types of organelles, and
each type has its own special job to perform.
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Organelles
Organelle
Plants
Only
Animals
Only
Both
nucleus
X
cell membrane
X
cell wall
X
chloroplast
X
lysosome
X
mitochondria
X
ribosome
X
central vacuole
X
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Plant Cells vs. Animal Cells
Plants Only
Both
Animals Only
cell wall
nucleus
lysosome
chloroplast
cell membrane
central vacuole
mitochondria
ribosome
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Conclusions
Why do plant and animals cells have so many
organelles in common?
Both kinds of cells have to perform many of
the same functions to stay alive.
Why do they have organelles that are different?
Plant and animal cells perform some
functions differently.
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Conclusions
Why do plant cells have chloroplasts, and why
don't animal cells have them?
Plants make their own food by
photosynthesis, and animals don't.
Why do animal cells have lysosomes, and why
don't plant cells have them?
Animals eat food from their environment,
and plants don't.
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