What is a hypertonic solution?
A solution that has a lower concentration of water.
Dehydration is another form of what kind of passive transport?
What is the difference between pinocytosis and phagocytosis?
Pintocytosis takes in small molecules; phagocytosis takes in large molecules.
What does "selectively permeable" mean?
Some molecules can get through, but not all.
In the sodium potassium pump, how many sodium and pottasium ions are carried?
3 sodium out, 2 potassium in.
What is the driving force behind passive transport?
Which part of the phospholipid bilayer is hydrophobic?
The interior- where the hydrocarbon tails are located.
What is endocytosis?
Cells ingest particles too big to fit through channels and carrier proteins.
What are the 3 functions of the nervous system?
Sensory input, intragration, and motor output.
What is threshold?
The point at which any additional sodium ions will cause the action potential to occur.
What happens during repolarization?
Potassium and sodium ions are being pumped out of the axon.
Neurotransmitters are released into the synapse using which mechanism of secretion?
A protist is placed in a hypotonic environment and dies. What happened?
Water enters the prosist by osmosis (protist bursts)
What is the difference between active and passive transport?
Active transport involves ATP; Passive transport is always from high to low concentration.
What is the definition of cytolysis?
Cells take in water and swell up and burst.
What kind of molecules use facilitated diffusion to cross the cell membrane?
Carrier proteins move molecules by changing their _____.
A cell with low turgor pressure is probably in a _________ environment.
During the lab, why did the dialysis tube turn black?
Iodine diffused into the bag.
Why are cell membranes fluid?
Their hydrocarbon tails cannot pack tightly together due to cholesterol and double bonds.
What is the voltage during resting potential?
About -70 mV
What happens during depolarization?
Voltage gated sodium channels open allowing sodium ions to flow into the axon.
Why did Aunt Prunilda's jam not spoil?
Bacteria landing on it went through plasmolysis and died.
Which class of ogranic molecules are involved in moving substances across the membrane?
What happens to a cell placed in an isotonic environement?
It does not change size.
Whlat is the definition of plasmolysis?
Cells lose water and shrink in size.
What is the driving force behind diffusion?
Random motion of molecules
What kind of molecules move during osmosis?
What is a solute?
A molecule dissolved in a solvent.
What would happen to a fresh water protist that was placed in saltwater?
It would plasmolyze (shrinkk)
A cell placed in a hypertonic environment will move its water mocules until ____________.
Which part of the neuron receives signals?
Which part of the neuron delivers signals?
Wilting is caused by ____________.
Low turgor pressure; plasmolysis
What happened when you put your elodea leaf in salt solution?
The cytoplasm (chloroplasts) bunched up in the middle because of plasmolysis.