AP BIOLOGY

Detailed explanation-1: -Active transport uses energy to transport molecules across the plasma membrane. This uses energy from ATP. They also use pumps to get molecules in or out of the cell. Passive Transport does NOT use energy to transport molecules across the membrane.

Detailed explanation-2: -ATP plays a critical role in the transport of macromolecules such as proteins and lipids into and out of the cell. The hydrolysis of ATP provides the required energy for active transport mechanisms to carry such molecules across a concentration gradient.

Detailed explanation-3: -Active transport requires energy. It could be compared to a ball moving up a hill. Active transport is the transport of molecules that require the use of energy, in the form of an energy-storing chemical called ATP (adenosine triphosphate) to help them cross the cell membrane.

Detailed explanation-4: -Because the transport process uses ATP as an energy source, it is considered an example of primary active transport.