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Cell Transport Webquest
Terms in this set (22)
what is meant by cell transport?
cell transport refers to the movement of compounds across the outer wall or membrane of a cell
Defend this statement: living organisms must be able to transport material in and out of the cell in order to live
yes, living organisms must be able to transport materials in and out of cells to maintain homeostasis and keep cell processes running efficiently
Whether or not a molecule can pass through the cell membrane is determined by .......
size and polarity
How are smaler molecules like O2 and CO2 able to pass through the openings of the cell membrane?
small molecules like oxygen and carbon dioxide can simply diffuse through the cell membrane
In terms of molecules, explain what happens to a sugar cube when it is placed into a beaker of water
the sugar molecules will move from where they are (at a high concentration of sugar) to the rest of the beaker where there is a low concentration of sugar until the sugar is evenly dispersed (equilibrium)
the movement of atoms or molecules from an area of higher concentration to an area of lower concentration
What can affect the rate of diffusion?
temperature and size of a molecule
Predict: What would happen if you drop the sugar cube into a beaker of hot water vs a beaker of cold water
diffusion would happen faster in the hot water than in the cold water (think alka seltzer lab)
What is facilitated diffusion
A type of diffusion that requires a special carrier protein in the cell membrane to move particles back and forth across the membrane
Explain what it means to say these protein channels are selective in what they allow into or out of the cell
selectivity means that the channel can only carry a specific item (whether it be an ion, molecule, protein, or sugar)
Facilitated diffusion involved the movement of particles (with/against) the concentration gradient
Facilitated diffusion requires going down its concentration gradient(against)
What is a similarity between facilitated and simple diffusion
both do not require energy
What are some differences between facilitated and simple diffusion?
Simple Diffusion- through the phospholipid bilayer; happens to the small and non-polar molecules
Facilitated Diffusion- through the transport protein; happens to large and polar molecules
Osmosis is the net movement of molecules down a concentration gradient. This process allows small molecules such as oxygen and carbon dioxide to cross the plasma membrane
Why did the water molecules move from the left to the right side?
The molecules move across the semi permiable membrane towards the area of more solute
The solutions with ________________ concentration solutes is hypertonic
The solution with _________________ concentration solutes in hypotonic
Define active transport
when a cell uses energy to transport something across a membrane
Why do cells need to do active transport?
sometimes a cell has to work and use energy to maintain a proper balance of a cell's ions and molecules
Describe one specific case where the body uses active transport
proton pump in stomach
What is a similarity between active and passive transport?
transport of substances
What are some differences between active and passive transport?
Active- diffusion high to low, osmosis, no energy
Passive- engulfing, transport protein low to high, requires energy
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