Question

Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the

Answer 1

Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from a low concentration to a high concentration. Active transport is usually associated with accumulating high concentrations of molecules that the cell needs, such as ions, glucose and amino acids. If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient. Active transport uses cellular energy, unlike passive transport, which does not use cellular energy. Active transport is a good example of a process for which cells require energy. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.

this link will further help you
http://en.wikipedia.org/wiki/Active_transport

Answer 2

it will require energy because it is moving against the concentration gradient