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Cells (Ch.3)

Unit 1, L.4-5

TermDefinition
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