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. the cell membrane prevents any molecules from exiting the cell. passive transport does not require energy from the cell. some molecules require cellular energy to cross the cell membrane. cells must maintain a stable internal environment.

Explanation:

• The cell membrane is semi - permeable, not completely impermeable. So, the statement "The cell membrane prevents any molecules from exiting the cell" is false.
• As per the given definition, passive transport does not use cellular energy. So, "Passive transport does not require energy from the cell" is true.
• Active transport (a type of molecular movement across the membrane) requires cellular energy. So, "Some molecules require cellular energy to cross the cell membrane" is true.
• Homeostasis is a fundamental concept in cell biology, which means cells must maintain a stable internal environment. So, "Cells must maintain a stable internal environment" is true.

Answer:

B. Passive transport does not require energy from the cell.
C. Some molecules require cellular energy to cross the cell membrane.
D. Cells must maintain a stable internal environment.