Secondary active transport
A) involves the use of endocytosis.
B) involves the active transport of one substance to establish a concentration gradient thereby providing energy for the movement of a second substance.
C) involves the use of exocytosis.
D) involves the passive transport of one substance to establish a concentration gradient thereby providing energy for the movement of a second substance.
E) involves the facilitated transport of one substance which then 'pulls' along a second substance.

Question

Quizplus · Accepted Answer

Secondary active transport involves the active transport of one substance (often an ion) which creates a concentration gradient across a membrane. This gradient provides the energy needed for the movement of a second substance, which is often moved against its concentration gradient. This movement is achieved through a transporter protein that uses the energy stored in the gradient of the first ion to move the second substance. This process is also known as co-transport or coupled transport. Endocytosis and exocytosis are not involved in secondary active transport. Passive transport and facilitated transport do not involve the active movement of one substance to create a gradient for the movement of a second substance.

Secondary Active Transport