Question

some molecules can cross the cell membrane without using cellular energy. this movement is called passive transport. other molecules need to use energy from the cell to move across the membrane. this movement is called active transport. select the true statements. some molecules require cellular energy to cross the cell membrane. cells must maintain a stable internal environment. passive transport does not require energy from the cell. the cell membrane prevents any molecules from exiting the cell.

Explanation:

1. Active transport, as described, needs cellular energy for molecule - membrane crossing.
2. Homeostasis dictates cells maintain internal stability.
3. By definition, passive transport is energy - free. The statement "The cell membrane prevents any molecules from exiting the cell" is false as the cell membrane is semi - permeable and allows certain molecules to pass in and out.

Answer:

1. Some molecules require cellular energy to cross the cell membrane.
2. Cells must maintain a stable internal environment.
3. Passive transport does not require energy from the cell.