Physiology Lab- Quiz 2
A primary active transport process results in the breakdown of ______ into ATP & Pi.
ATP
The sodium potassium pump is an example of a primary active transport because it uses ______ as an energy source.
ATP
Facilitated diffusion is a passive process; it requires a _______ to drive it.
concentration gradient
Molecules crossing a membrane via a transport protein are crossing by ______.
facilitated diffusion
Active transport processes can only move molecules from an area of higher concentration to areas of lower concentration.
false
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
The Ca++/Na+ antiporter is actually a symporter.
false
The sodium potassium pump is an example of a uniporter.
false
Uniporters can be bidirectional.
false
At saturation, increasing the concentration of substrate will _______.
not affect the rate of the transport
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
The sodium potassium pump pumps three _____ out of the cell and two _____ into the cell.
sodium ions/ potassium ions
A cotransporter that moves molecules in the same direction is called a(n) ______.
symporter
A transport protein that moves two molecules across the membrane in the same direction is called a(n) _________.
symporter
If molecule A is moving down its concentration gradient from the outside of the cell to the inside of the cell, but stops moving when you reverse the gradient, then ________.
the transport protein is unidirectional
For secondary active transport to occur, a primary active transport process must have occurred to create and/or maintain a concentration gradient.
true
The Ca++/Na+ antiporter uses the concentration gradient of Na+ as an energy source.
true
Transport proteins tend to be very specific to the size, shape, and charge of the substrate molecules that they move.
true
A transport protein that can only move one type of molecule is called a(n)
uniporter
