Physiology Lab- midterm study guide (part 2)
The sodium-potassium pump pumps 3 _____ out of the cell and 2 ______ into the cell.
3 sodium and 2 potassium
A primary active transport process results in the breakdown of _________ to ADP + Pi.
ATP
The sodium-potassium pump is an example of a primary active transport because it uses ________ as an energy source.
ATP
A cotransporter that moves molecules in opposite directions is called ______________.
antiporter
If net diffusion is occurring, there will be a net change in ____________ over time.
concentration
Facilitated diffusion is a passive process, it requires a ____________.
concentration gradient
______________ is the difference in concentration between two areas.
concentration gradient
Molecules crossing a membrane via transport protein are crossing by ______________.
facilitated diffusion
T/F: Active transport processes can only move molecules from areas of higher concentration to areas of lower concentration.
false
T/F: All osmotically active molecules dissociate in water to form multiple particles.
false
T/F: At saturation, there are not enough substrate molecules available to support the cell mediated transport process. This causes the rate of transport to decrease.
false
T/F: Pure water is hypertonic and would cause cells to crenate.
false
T/F: The Ca+/Na+ antiporter is actually a symporter.
false
T/F: The sodium-potassium pump is an example of a uniporter.
false
T/F: Uniporters cannot be bidirectional.
false
The movement of water from one side of a semipermeable membrane to the other is called ___________.
osmosis
A cell mediated transport process that uses ATP as an energy source is called _________________.
primary active transport
The level of substrate concentration at which all transport proteins are occupied and busy is called _____________.
saturation
Molecules crossing a membrane by passing between the phospholipids are crossing by __________.
simple diffusion
A cotransporter that moves molecules in the same direction is called a _________________.
symporter
A transport protein that moves two molecules across the membrane in the same direction is called a __________.
symporter
T/F: For secondary active transport to occur, a primary active transport process must have occurred to create and/or maintain a concentration gradient.
true
T/F: The Ca+/Na+ antiporter uses the concentration of Na+ as an energy source.
true
T/F: Transport proteins tend to be very specific to the size, shape, and charge of the substrate molecules that they move.
true
If molecule A is moving down its concentration gradient from the outside to inside of cell, but stops moving when you reverse the gradient, then the transport protein is __________.
unidirectional
A transport protein that can only move one type of molecule is called a _______________.
uniporter
At saturation, increasing the concentration of the substrate _______________.
will not affect the rate of transport
