1.4: Membrane Transport (IB Biology)

Front

What is membrane transport?

Back

Membrane transport refers to the mechanisms by which substances move across the cell membrane, including passive and active transport.

Front

Define passive transport.

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically along a concentration gradient.

Front

What is osmosis?

Back

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

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the cell membrane.

Front

Define hypertonic solution.

Back

A hypertonic solution has a higher concentration of solutes compared to another solution, leading to water moving out of cells placed in this solution.

Front

Define hypotonic solution.

Back

A hypotonic solution has a lower concentration of solutes compared to another solution, causing water to move into cells placed in this solution.

Front

What is isotonic solution?

Back

An isotonic solution has the same concentration of solutes as another solution, resulting in no net movement of water across the membrane.

Front

Explain the role of transport proteins in membrane transport.

Back

Transport proteins facilitate the movement of specific molecules across the cell membrane, either by passive or active transport.

Front

What happens to plant cells in a hypertonic solution?

Back

Plant cells lose water and undergo plasmolysis when placed in a hypertonic solution.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (ATP) to do so.