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What is the basic unit of life?
What are the levels of organization in order? Examples?
- 1. Cell - Human Cells
- 2. Tissue - Heart Tissue
- 3. Organ - Heart
- 4. Organ System - Digestive System
- 5. Organism - Llama
- 6. Population -Llamas
- 7. Community - Forest
- 8. Ecosystem - Oceanic Ecosystem
What contributions were made by Robert Hooke and Anton van Leeuwenhoek?
Hooke: "The cell is the basic unit of life" - Looked at cork and found dead cells
Leeuwenhoek: Studied tooth plaque and pond scum, looked at living cells
What are the 3 parts of the cell theory?
- 1. All living things are composed of cells
- 2. Cells are the basic unit of life
- 3. All cells come from pre-existing cells
What do all cells have in common?
- Small size
- Heredity Material
Why do cells not get larger?
Because they need to balance out in order to stay stable
What are some advantages of being multicellular rather than being unicellular?
- -More cells for reproduction
- -More variety
What is the difference between prokaryotic and eukaryotic cells?
Prokaryotic: No nucleus, no membrane covered organelles, circular DNA
Eukaryotic: Has a nucleus, has membrane covered organelles, linear DNA
What is the function of the cell wall and cell membrane? What are they made of?
Cell Wall : Found only in plants, made of cellulose, and protects and supports the cell
Cell Membrane : Made of phospholipids, controls what comes in and out of the cell, and supports the cell
What is the difference between plants and animal cells?
Plant Cells have a cell wall and chloroplast
Animal Cells have lysosomes and centrioles