Active vs. Passive Transport

Front

What is osmosis?

Back

Osmosis is the movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

How do water molecules move during osmosis when a cell is in a hypertonic solution?

Back

Water molecules move out of the cell, causing the cell to shrink.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process where channel proteins help molecules that cannot directly cross the cell membrane to enter or exit the cell.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move molecules against their concentration gradient (from low to high), while passive transport does not require energy and moves molecules along their concentration gradient (from high to low).

Front

What happens to a blood cell placed in an isotonic solution?

Back

In an isotonic solution, water moves equally in and out of the cell, maintaining its shape.

Front

What is the role of channel proteins in the cell membrane?

Back

Channel proteins facilitate the transport of specific substances across the cell membrane that cannot pass through the lipid bilayer directly.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules from areas of high concentration to areas of low concentration.

Front

What is the outcome when a cell is placed in a hypotonic solution?

Back

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

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy, often in the form of ATP.

Front

What is simple diffusion?

Back

Simple diffusion is the process by which small or nonpolar molecules move directly through the lipid bilayer of the cell membrane from an area of high concentration to an area of low concentration.