2024-2025 Unit 3: Frequently Missed Retake Scenarios

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration until equilibrium is reached.

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 high to low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, from low to high concentration, requiring energy in the form of ATP.

Front

What does it mean for a solution to be hypertonic?

Back

A hypertonic solution has a higher solute concentration compared to another solution, causing cells to lose water and potentially shrink.

Front

What is the role of ATP in cellular transport?

Back

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

Front

What happens to red blood cells in a hypotonic solution?

Back

In a hypotonic solution, red blood cells swell and may burst due to the influx of water, as the solute concentration is lower outside the cell.

Front

What is the difference between osmosis and diffusion?

Back

Osmosis is the diffusion of water across a selectively permeable membrane, while diffusion refers to the movement of any type of molecule.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas, which drives the movement of molecules.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, maintaining the internal environment of the cell.