Active & Passive Transport

Front

What is active transport?

Back

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

Front

What is passive transport?

Back

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

Front

What is osmosis?

Back

Osmosis is the passive transport of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What does it mean for a membrane to be semi-permeable?

Back

A semi-permeable membrane allows certain molecules to pass through while blocking others, enabling selective transport.

Front

What is the difference between isotonic, hypertonic, and hypotonic solutions?

Back

Isotonic solutions have equal concentrations of solute inside and outside the cell; hypertonic solutions have a higher concentration outside, causing the cell to lose water; hypotonic solutions have a lower concentration outside, causing the cell to gain water.

Front

What is the role of ATP in active transport?

Back

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

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 without energy.

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 high to low concentration.

Front

What is endocytosis?

Back

Endocytosis is an active transport process where cells engulf substances into a vesicle to bring them into the cell.

Front

What is exocytosis?

Back

Exocytosis is an active transport process where cells expel materials in vesicles to the outside of the cell.