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Chapter 3.3-3.5: Cell Membrane and Diffusion
Terms in this set (50)
If there is a protein in the membrane, is the part touching the phosopholipid tails polar or non-polar?
two-layer "sandwich" of molecules that surrounds a cell
polar heads are attracted to water inside and outside of cell
How do phospholipid molecules naturally align themselves to form membranes?
It is constantly moving
What does the "fluid" part of "fluid-mosaic model" tell you about the membrane?
It is made up of various components
What does the "mosaic" part of "fluid-mosaic model" tell you about the membrane?
regulate what molecules cross the membrane
role of proteins in membrane
identify (and differentiate) cell types
role of carbs in membrane
role of cholesterol in membrane
aquaporin (a special channel)
How do water molecules cross the cell membrane?
energy of motion
molecules are in __ motion
Do molecules stop moving at equilibrium?
continuous movement of particles but no overall change in concentration
difference in the concentration of a substance from one location to another
Will substances move up or down their concentration gradients without the cell expending energy?
Will substances move up or down their concentration gradients with the investment of energy?
having a lower concentration of solute than another solution
when the concentration of two solutions is the same
when comparing two solutions, the solution with the greater concentration of solutes
cells in a hypertonic environment __
cells in a hypotonic environment __
the bursting of a cell (occurs in hypotonic solutions)
this happens when a cell shrinks inside its cell wall while the cell wall remains intact (occurs in hypertonic solutions)
the substance that is dissolved
a liquid substance capable of dissolving other substances
yes (it does not often burst)
Does a plant cell wall offer protection to a hypotonic environment?
movement of specific molecules across cell membranes through protein channels
Does facilitated diffusion require the cell to use energy?
polar and charged, too large
What are the two main categories of molecules that cross through membranes using facilitated diffusion?
Na+, K+, glucose, water
What are some specific examples of molecules that cross the membrane using facilitated diffusion? (4)
the movement of materials through a cell membrane using energy
exocytosis, endocytosis, sodium-potassium pump
What are some examples of active transport? (3)
sodium potassium pump
a carrier protein that actively transports K+ ions into and Na+ ions out of animal cells
an electrogenic pump that works largely with H+ ions in plants, fungi, and bacteria
What does ATP provide for cells?
What eukaryotic organelle makes a lot of ATP when oxygen is available?
uptake of liquids or large molecules into a cell by inward folding of the cell membrane
active transport process by which materials are secreted or expelled from a cell
the cell takes in liquids (the cell drinks)
a cell engulfs large particles or whole cells (the cell eats)
measure of concentration
(final mass - initial mass)/initial mass (x100)
percent change in mass equation
line of best fit
line type used in the "Unknown Mystery Solution" lab
percent change in mass
dependent variable in the "Unknown Mystery Solution" lab
independent variable in the "Unknown Mystery Solution" lab
iodine, glucose (monosaccharide), water
substances that could cross the membrane in the "Unknown Mystery Solution" lab
sucrose (disaccharide), starch
substances that could not cross the membrane in the "Unknown Mystery Solution" lab
size, polarity, concentration
What are three factors that affect a molecule's ability to cross the cell membrane?
find out concentration of an unknown solution
purpose of the "Unknown Mystery Solution" lab