CELL MEMBRANE
PASSIVE TRANSPORT
LABS
ACTIVE TRANSPORT
RANDOM
100
There are two main molecules that make up the cell membrane - what are they
phospholipids and proteins
100
The diffusion of water through a selectively permeable membrane is called
osmosis
100
What happened to the egg (cell model) when soaked in syrup?
It lost mass / it shrunk
100
The sodium potassium pump requires no energy. True or False?
False
100
What do cells use for energy for active transport?
ATP
200
In the cell membrane, ions require what to cross the membrane
Ion Channels - carrier Proteins
200
In passive transport, which direction do molecules move? (Low to High concentrations or High to Low concentrations)
High to Low concentration
200
Which liquid was hypotonic to the egg - Water or syrup?
water
200
Active transport moves molecules in which direction?
(High to Low concentration OR Low to High Concentration?)
Low to High
200
How does facilitated diffusion differ from other passive transport processes?
It requires a transport / carrier protein.
300
The lipid bilayer is semi-permeable, what does that mean
It controls what can enter and leave the cell - only certain things can cross the membrane.
300
When molecules move through a cell using facilitated diffusion, is energy used
NO - it's passive transport
300
When perfume is spilled in a room, people in another room will soon smell it. This is an example of
diffusion
300
How does a cell consume a food particle that is too large to pass through a protein channel?
Endocytosis
300
Unlike passive transport, active transport
a) requires energy
b)moves substances down the concentration gradient
c) does not involve carrier proteins
d) all of the above
a) requires energy
400
To pass through a cell membrane, water requires carrier proteins. True or False
False
400
A. Molecules that move from high to low concentration are moving with or against the gradient?
B. What happens when there is no longer a gradient?
A. With the gradient
B. The molecules have reached equillibrium (equal concentrations) - they continue to move randomly, however their is no net gain or loss.
400
What is the best way to keep vegetable slices crisp - soaking in cold water or soaking in salt water?
cold water
400
Which active transport process does this diagram illustrate?
Exocytosis
400
Phospholipids contain a polar "head" made of phosphate and a nonpolar tail. True or False?
True
500
Which type of molecules require a carrier protein
ions and polar molecules such as sugar
500
Identify three transport processes in cells that do not require energy, briefly describe each.
1. Diffusion
2. Osmosis
3. Facilitated Diffusion
500
Identify the three types of solutions based on the cell reactions.
Lysed cell = hypotonic
Normal cell = isotonic
Shriveled cell = hypertonic
500
Active transport "stockpiles" materials by pumping them with the gradient. True or False?
False
500
Protists use contractive vacuoles to expel excess water. If a paramecium's contractive vacuaole were to suddenly contract faster, would this mean that the environment became more hypotonic or more hypertonic? Explain.
Hypotonic - more water flowing into the cell requires faster contractions to get rid of it