1

Day 21What 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.

Plant & Animal Cells

Contrasting Case Activity 4bInvestigation 4 – The Cell

Plants & AnimalsAre 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

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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.

Organelles

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OrganellePlants Only

Animals Only

Both

nucleus

cell membrane

cell wall

chloroplast

lysosome

mitochondria

ribosome

central vacuole

X

X

X

X

X

X

X

X

Plant Cells vs. Animal Cells

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lysosomecell wall

chloroplast

central vacuole

cell membrane

mitochondria

nucleus

ribosome

Plants Only Animals OnlyBoth

Conclusions

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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.

Conclusions

8

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.