Cell Membrane and Cell Wall Function Flashcards
definition of cell membrane
thin layer seperating contents from outside cell
definition of diffusion
particle move from area of higher concentration to area of lower concentration so that all particles are equal
definition of solute
particles dissolved in water
definition of solvent
liquid that dissolves solute
definition of osmotic pressure
pressure, due to flow of H2O from area of higher concent. to area of lower concent.
definition of isotonic solution
same strength solution
definition of hypertonic solution + what does it do
greater strength solution (takes away water from cell)
definition of hypotonic solution
lower concentration of solute, which means higher concentration of water
definition of plasmolysis
when plant cell shrinks (too little h2o)
definition of turgor pressure
when plant cell swells up on itself
definition of facilitated transport + which way on concent. gradient
passes 1 type of molec in and out of cell, it passes down on the concentration gradient (no energy required)
definition of crenation
animal cell shrinks (loses h2o)
definition of active transport + which way on cencent. gradient
move molecs from area of lower concent to area of higher concent, it requires energy (against concent gradient)
definition of endocytosis
cell membrane forms vessicle around substance to be taken into cell
definition of phagocytosis
endocytosis of larger particles
definition of pinocytosis
endocytosis of smaller particles
definition of exocytosis
vacuole(vessicle) fuses with cell membrane and substances leave cell
definition of glycolipid
carbs strung in chains attatched to lipids on membrane
definition of fluid mosaic model
model of cell memb. 2 phospholipid layers with proteins (selectively permeable)
what is osmosis
movement of water from area of higher concentration to area of lower concentration, across selectively permeable membrane
what happens to animal cell in hypertonic solution
hemolysis (cell bursts)
what happens to animal cell in hypotonic solution (what is process called)
crenation (cell shrinks)
turgor pressure is best exemplified by placing a plant cell in a
hypotonic solution
3 facts about active transport that differ from facilitated transport
-requires energy (ATP)
-moves against concent gradient
-not highly specific
3 facts about facilitated transport that differ from active transport
-no energy req (no ATP)
-highly specific
-moves down concent gradient
(T or F) salt can move in and out of cell
F
(T or F) if a cell uses active transport to take in salt, then osmosis will follow and water will enter the cell
T
An animal cell will take in water when placed in a ________ solution
hypotonic
definition of concentration gradient
The difference in concentration of a particle b/w two areas