Which one of the following is an example of secondary active transport?
A)the use of an electrochemical gradient of one molecule to move a second molecule
B)the movement of potassium ions following the initial movement of sodium ions
C)the use of more than one type of transport protein for the movement of a molecule
D)the use of a chemical gradient to generate an electrical gradient

Question

Quizplus · Accepted Answer

Secondary active transport involves the use of an electrochemical gradient (created by primary active transport) to move a second molecule against its concentration gradient. Choice B describes co-transport, which is a type of secondary active transport. Choice C describes facilitated diffusion, which is a type of passive transport. Choice D describes the process of electrochemical coupling, which is involved in some cases of secondary active transport, but is not a complete description of the process itself.

Which One of the Following Is an Example of Secondary