Diffusion Through A Membrane

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until they are evenly distributed.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, controlling the movement of substances in and out of the cell.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is the starch indicator used for?

Back

The starch indicator, commonly iodine, is used to test for the presence of starch in a solution, turning blue-black in its presence.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink or crenate due to loss of water.

Front

What happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water moves into the cell, causing it to swell and potentially burst due to excess water intake.

Front

What is the role of the dialysis tubing in the lab setup?

Back

The dialysis tubing acts as a selectively permeable membrane, allowing certain molecules to pass through while preventing others from doing so.

Front

What is the significance of the starch indicator turning blue-black?

Back

The blue-black color indicates the presence of starch in the solution, confirming that starch has diffused into the area where the indicator is present.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What is the function of the cell membrane?

Back

The cell membrane protects the cell, provides structure, and regulates the movement of substances in and out of the cell.