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Cells (Ch.3)
Unit 1, L.4-5
| Term | Definition |
|---|---|
| diffusion | movement of particles from an area of higher concentration to an area of lower concentration |
| turgor pressure | the internal pressure created by the diffusion of water into a plant cell (like air filling a balloon) |
| osmosis | the diffusion of water through a membrane |
| selectively permeable membranes | allow some substances to pass through them while blocking others (like a colander) |
| active transport | another way substances move across a cell membrane (in addition to diffusion an osmosis) - use energy, proteins do the work, ex. sodium potassium pump |
| passive transport | diffusion and osmosis |
| binary fission | cells with no nucleus (no brain) split into 2 identical cells in 30 minutes (bacteria does this-it has no nucleus) |
| mitosis | cells with a nucleus duplicate DNA to create 2 new identical cells |
| meiosis | cell division in which 4 new cells with 1/2 the number of chromosomes are produced; determines if babies will be a boy or a girl |
Created by:
joshuabelvin
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