The cell theory There are 3 MAIN POINTS

There are 3 MAIN POINTS of CELL THEORY: 1. the cell is the basic

Types of cells • EUKARYOTIC cells – these include plant and animal cells •

Features Eukaryotic Cells Prokaryotic Cells - more complex cells - many organelles - have

Bacteria • Are all bacteria harmful? • No. Some are helpful • Examples –

Bacteria continued • some bacteria can be harmful too • Examples – Foodborne illness

Shapes of Bacteria • There are THREE COMMON SHAPES • (1) COCCI (2) BACILLI

Viruses • Are viruses living things? NO! • Do they have any characteristics of

Viruses • VIRUSES ARE THE WORST HOUSE GUESTS! • They HIJACK the cell’s organelles,

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The cell theory

There are 3 MAIN POINTS of CELL THEORY: 1. the cell is the basic unit of life 2. all organisms are composed of ONE or more cells 3. All cells (living things) come from other LIVING THINGS

Types of cells • EUKARYOTIC cells – these include plant and animal cells • PROKARYOTIC cells – these include bacteria

Features Eukaryotic Cells Prokaryotic Cells - more complex cells - many organelles - have a TRUE nucleus - simple cells - no nucleus ex: Plant , Animal cells ex: Bacteria cells

Bacteria • Are all bacteria harmful? • No. Some are helpful • Examples – in food, fuel, medications – decompose materials – help you digest food (in your intestinal tract)

Bacteria continued • some bacteria can be harmful too • Examples – Foodborne illness (E-coli, salmonella) – Illness (cause TB, Syphilis)

Shapes of Bacteria • There are THREE COMMON SHAPES • (1) COCCI (2) BACILLI (3) SPIRILLA spheres rods spirals

Shapes of Bacteria

Viruses • Are viruses living things? NO! • Do they have any characteristics of living things? – Reproduction!

Viruses • VIRUSES ARE THE WORST HOUSE GUESTS! • They HIJACK the cell’s organelles, make COPIES of the viral GENETIC MATERIAL, and then RELEASE the virus! • When the virus is released, it often KILLS the cell • Examples of viruses: measles, the flu, smallpox, HIV