Endocytosis and exocytosis are forms of active transport. What is active transport?(1 point) Responses the movement of molecules up a concentration gradient from low to high, using no energy the movement of molecules up a concentration gradient from low to high, using no energy the movement of molecules down a concentration gradient from high to low, using energy the movement of molecules down a concentration gradient from high to low, using energy the movement of molecules down a concentration gradient from high to low, using no energy the movement of molecules down a concentration gradient from high to low, using no energy the movement of molecules up a concentration gradient from low to high, using energy
The correct answer is: the movement of molecules up a concentration gradient from low to high, using energy.
Active transport is the movement of molecules against their concentration gradient, going from an area of lower concentration to an area of higher concentration. This process requires the input of energy. Therefore, the correct definition of active transport is:
"The movement of molecules up a concentration gradient from low to high, using energy."