Question

Which of the following is a typical feature of an ATP-driven active transport mechanism?

a) The transport protein is irreversibly phosphorylated as transport takes place.
b) The transport protein catalyzes the conversion of ADP to ATP.
c) The solute moves against the concentration gradient.
d) The transport protein must cross to the correct side of the membrane before the solute can bind to it.

Answer 1

The solute moves against the concentration gradient. (Ans. C)

Step-by-step explanation:

Active transport: In this transport a substance moves against a concentration gradient. Active transport mechanism expending the energy to maintain ions or molecules right concentration in living cells. Active transport basically divided into two types:

1) Primary active transport: In which for the movement of ions across the membrane against their gradient they use directly a source of chemical energy from ATP. Example of active transport is sodium potassium pump.

2) Secondary active transport: It is also called as co-transport. They are using electrochemical gradient which is generated by active transport. In which for the movement of ions across the membrane against their gradient, and they don't require a source of chemical energy from ATP.