8.3 Passive vs Active Transport

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, typically moving from an area of high concentration to an area of low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane against their concentration gradient, requiring energy (usually in the form of ATP).

Front

What happens to a cell in a hypotonic solution?

Back

A cell in a hypotonic solution will swell and may burst (lyse) due to the influx of water.

Front

What is the role of the cell membrane in living cells?

Back

The cell membrane acts as a barrier that regulates the entry and exit of substances, maintaining homeostasis within the cell.

Front

What is endocytosis?

Back

Endocytosis is a form of active transport where cells engulf substances from the outside environment, bringing them into the cell.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, driving the movement of molecules from high to low concentration.

Front

What is osmosis?

Back

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

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion is the movement of molecules from high to low concentration without assistance, while facilitated diffusion requires specific transport proteins to help move molecules across the membrane.

Front

What is the significance of ATP in active transport?

Back

ATP provides the energy required for active transport processes, allowing cells to move substances against their concentration gradient.

Front

What are the types of active transport?

Back

The two main types of active transport are primary active transport, which directly uses ATP, and secondary active transport, which uses the energy from the movement of other molecules.