Question

Bacterial cells are often found in very hypotonic environments. Which of the following characteristics keeps them from continuing to take on water from their environment?

• A. The presence of a cell wall allows a buildup of turgor pressure that prevents no more water from entering the cell.
• B. The presence of a cell wall allows a buildup of tonic pressure that prevents any more water from entering the cell.
• C. The cell expels water as fast as it takes it up.
• D. None of the above.

Answer 1

The correct option is A

The presence of a cell wall allows a buildup of turgor pressure that prevents no more water from entering the cell.

The correct option is A:

Explanation of the correct option:

1. The presence of a cell wall allows a buildup of turgor pressure that prevents no more water from entering the cell.
2. When the cells are placed in a hypotonic solution(osmotic concentration is less than that of another solution), water diffuses into the cell causing the cytoplasm to build up a pressure against the wall.
3. This pressure is called turgor pressure.
4. Turgor pressure is the main cause of the enlargement of cells.
5. Once a cell is turgid, no more water intake occurs.

Final answer: The presence of a cell wall allows a buildup of turgor pressure that prevents no more water from entering the cell is a characteristic that keeps them from continuing to take on water from their environment.