1. 1 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.

2. Plant & Animal Cells Contrasting Case Activity 4b Investigation 4 – The Cell

3. 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.

4. Organelles 4 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.

5. Organelles 5 Organelle Plants Only Animals Only Both nucleus cell membrane cell wall chloroplast lysosome mitochondria ribosome central vacuole X X X X X X X X

6. Plant Cells vs. Animal Cells 6 lysosome cell wall chloroplast central vacuole cell membrane mitochondria nucleus ribosome Plants Only Animals Only Both

7. Conclusions 7 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.

8. 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.