Endocytosis and Exocytosis are forms of active transport. What is active transport?(1 Point)
A. The movement of molecules down a concentration gradient from high to low using no energy.
B. The movement of molecules up a concentration gradient from low to high using no energy
C. The movement of molecules up a concentration gradient from low to high using energy
D. The movement of molecules down a concentration gradient from high to low using l energy.
C. The movement of molecules up a concentration gradient from low to high using energy
C. The movement of molecules up a concentration gradient from low to high using energy
To determine the correct answer, we first need to understand what active transport is. Active transport is a process in which molecules or ions are moved across a cell membrane against their concentration gradient, meaning they are going from an area of low concentration to an area of high concentration. This movement requires the input of energy from the cell.
Now let's analyze the options:
A. The movement of molecules down a concentration gradient from high to low using no energy. This statement describes passive transport, not active transport. Passive transport does not require energy input from the cell.
B. The movement of molecules up a concentration gradient from low to high using no energy. This statement is incorrect. As mentioned earlier, active transport requires the input of energy from the cell.
C. The movement of molecules up a concentration gradient from low to high using energy. This statement correctly describes active transport. Molecules or ions are being transported against their concentration gradient, and this process requires the cell to expend energy.
D. The movement of molecules down a concentration gradient from high to low using l energy. This statement is incorrect. Active transport involves moving molecules against their concentration gradient, not with it.
Based on this analysis, the correct answer is C. The movement of molecules up a concentration gradient from low to high using energy.