| A | B |
|---|
| Cells | Basic units of life |
| Robert Hooke (1650) | Observed cork sections; coined the term "cell" |
| A. Van Leeuweenhoek (1675) | Observed living cells |
| M. Schleiden (1838) | Plant cells |
| T. Schwann (1839) | Animal cells |
| R. Viechow (1850) | Cell reproduction |
| Cell theory | 1. Cells are the units of structure and function and 2. all cells come from pre-existing cells |
| 3 Microscopes used when studying cells | Light microscope, Phase contrast microscope, electron microscopes, TEM, SEM |
| Electron microscopes | uses beams of electrons and magnets to produce an image |
| TEM | Transmission Electron Microscope --> Very high magnification |
| SEM | Scanning Electron Microscope --> 3-D view of surfaces |
| Unicellular | One cell |
| Multicellular | Many cells with "specialization" |
| Eukaryote | Cells with a nucleus |
| Prokaryote | Cells without a nucleus |
| Structures | Allows cells to carry out a life function |
| Cell membrane | "gatekeeper" |
| four characteristics of cell membrane | surrounds the cell, regulates the passage of materials, selectively permeable, and composed of protein & lipid molecules |
| cytoplasm | a colloid which surrounds the nucleus and contains organelles |
| nucleus | "control center" contains genetic material |
| chromosomes | composed of DNA |
| nucleolus | found within the nucleus; functions in protein synthesis (and contains RNA) |
| organelles | "tiny organs" |
