Multiple choice

Which transport system requires the expenditure of energy?

  1. Phloem

  2. Phagocytosis

  3. Osmosis

  4. Xylem vessels

  5. Active transport
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Active transport is the movement of a substance across a cell membrane against its concentration gradient from low to high concentration. In all cells, this is usually concerned with accumulating high concentration 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.

Keep practicing — related questions