Tonicity

During facilitated transport, a ____________________ speeds up the rate at which the solute crosses the plasma membrane toward a lower concentration.

Carrier Protein

Carrier Protein

Changes shape as it moves a solute across the membrane.

If you have a 10% sugar solution and a 35% sugar solution, how does the 10% solution compare to the 35% solution? a) isotonic b) sweeter c) osmotic d) hypotonic e) hypertonic

D) Hypotonic

Explanation of Isotonic Solution

In an Isotonic Solution, the solute and water concentration both inside and outside of the cell are equal, therefore, there is no net gain or loss of water.

Iso

Means same as.

Does Facilitated Transport require energy?

Neither diffusion nor facilitated transport require energy because molecules are moving down the concentration gradient.

Do you gain or lose water in an Isotonic Solution?

No because water and solute concentration are both equal in and out of cell.

Tonicity

Refers to osmotic pressure or tension of the solution.

Hypertonic solutions

Solutions that cause cells to shrink or shrivel due to loss of water are said to be hypertonic solutions. Higher concentration of solute than the cell.

Hypotonic solutions

Solutions that causes cells to swell or even burst due to an intake of water are hypotonic solutions. Has a lower concentration of solute than inside the cell.

When a plant cell is placed in a hypotonic solution, the cell wall prevents _____________________

The Cell from Bursting.

When water enters a plant cell what happens?

The vacuoles become enlarged.

Example of tonicity

Turgor Pressure is created when a plant cell swells in a hypotonic solution.

What happens to a cell placed in a hypotonic solution?

Water will enter the cell and the net movement of water is from outside to inside the cell.

What happens to a cell placed in a hypertonic solution?

Water will leave the cell and net movement is inside to outside the cell.

Hypertonic solutions a) lose water b) gain water c) higher solute concentration d) lower solute concentration e) an equal solute concentration

a) lose water

A cell placed in a hypotonic solution will a) lose water b) gain water c) neither gain or lose water d) lose water initially and then gain water e) gain water initially and then lose water

b) gain water

If 0.9% NaCL were isotonic to a cell, then a) 0.9% would be hypotonic b) 0.9% would be hypertonic c) 1.0% would be hypertonic d) 1.0% would be hypotonic e) 0.1% would be hypertonic

c) 1.0% would be hypertonic

Definition of Isotonic Solution a) greater than inside the cell b) less than inside the cell c) same as inside the cell d) has no effect on the cell e) greater than outside the cell

c) same as in the cell

Hypo means

less than

Hyper

means more