1. INTO THE REALM OF CELLS
Prokaryotes
Eukaryotes
Viruses

3. What do you already know about cells?
Cells are enclosed in semipermeable membranes
Cell Theory
All living organisms are composed of one or more cells
The cell is the most basic unit of structure, function, and organization in all organisms
Cells come from pre-existing, living cells

4. What are the two types of cells?
Prokaryotes characterized by the absence of a distinct, membrane-bound nucleus or membrane- bound organelles, and by DNA that is not organized into chromosomes. Examples: bacteria

5. What are the two types of cells?
Eukaryotes A single-celled or multi-cellular organism whose cells contain a distinct membrane- bound nucleus. Examples: Plant Cell Animal Cell

6. Prokaryote vs. Eukaryote
How are Prokaryotes and Eukaryotes similar?
How are Prokaryotes and Eukaryotes different?
Nucleus
Organelles
Cytoskeleton
Complex DNA
Large
Capsule
Circular DNA
Small
Cell Membrane
Ribosomes
Cytoplasm
Flagella

8. Eukaryote – Animal Cell
cells with a membrane-bound nucleus; have many different forms
Cheek Cell
Heart Cell

10. Eukaryote – Plant Cell
a cell that is a structural and functional unit of a plant
Cross-section of plant leaf

12. Animal Cell vs. Plant Cell
Cell Membrane
Endoplasmic Reticulum
Ribosomes
Mitochondria
Golgi Apparatus
Nucleus
Vacuoles
Nuclear Membrane
Cell Wall
Chloroplast
Centriole
Lysosomes

13. Viruses
Any of various simple submicroscopic parasites of plants, animals, and bacteria that often cause disease and that consist essentially of a core of RNA or DNA surrounded by a protein coat. Unable to replicate without a host cell, viruses are typically not considered living organisms. Example: Common Cold, Ebola, AIDs

14. General Structure of a Virus

15. Let’s Compare Them! Prokaryote Eukaryote Viruses Cell Membrane
Ribosomes
Cytoplasm
Flagella
Nucleus
Organelles
Cytoskeleton
Complex DNA
Large
Capsule
Circular DNA
Small
DNA or RNA
No Cell
Viruses

16. Why does this matter?
By knowing how a virus infects different types of cells, we can create vaccines
Cells are the building blocks of life
Without this knowledge, serious diseases like cancer cannot be stopped
By understanding plant cells, we can see how they benefit humans
Food, medicines, heat (burning of wood), buildings

17. Discussion Question
What would the world be like without viruses? Would it be a better place? Why or Why not?