AP Bio Insta-Review Topic 2.8*: Tonicity & Osmoregulation

Front

What is Tonicity?

Back

Tonicity refers to the ability of a surrounding solution to cause a cell to gain or lose water. It is determined by the concentration of solutes in the solution compared to the concentration of solutes inside the cell.

Front

Define Osmoregulation.

Back

Osmoregulation is the process by which organisms regulate the water and solute concentrations in their bodies to maintain homeostasis.

Front

What happens to a plant cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the plant cell, causing it to lose turgor pressure and become plasmolyzed.

Front

What is the pressure potential in a turgid plant cell?

Back

The pressure potential in a turgid plant cell is positive due to the pressure exerted by the cell wall against the cell's internal pressure.

Front

How does solute concentration affect water potential?

Back

The higher the solute concentration, the lower the water potential, as water moves from areas of high water potential to low water potential.

Front

What is a hypertonic solution?

Back

A hypertonic solution is one that has a higher solute concentration compared to another solution, leading to water moving out of the cell.

Front

What is an isotonic solution?

Back

An isotonic solution has equal solute concentrations inside and outside the cell, resulting in no net movement of water.

Front

What occurs when an animal cell is placed in a hypotonic solution?

Back

When an animal cell is placed in a hypotonic solution, water enters the cell, potentially causing it to swell and undergo lysis.

Front

What is the result of placing a cell in a 0.5M extracellular solution when the cell is 1.0M?

Back

The animal cell will undergo lysis due to the influx of water from the hypotonic solution.

Front

What is the direction of water movement in an isotonic solution?

Back

In an isotonic solution, water moves equally into and out of the cell, maintaining cell size.