Cellular Transport Test

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that allows large or polar molecules to cross the cell membrane with the help of protein channels, moving along the concentration gradient.

Front

Define hypertonic solution.

Back

A hypertonic solution is one where the concentration of solutes is higher outside the cell than inside, causing water to move out of the cell.

Front

What is osmosis?

Back

Osmosis is the movement 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 active transport?

Back

Active transport is the movement of molecules across a cell membrane against their concentration gradient, requiring energy (ATP) and often involving protein pumps.

Front

Explain the process of diffusion.

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes outside the cell compared to inside, leading to water moving into the cell.

Front

What role do protein channels play in cellular transport?

Back

Protein channels facilitate the transport of specific molecules across the cell membrane, particularly those that cannot easily pass through the lipid bilayer.

Front

What is isotonic solution?

Back

An isotonic solution has equal concentrations of solutes inside and outside the cell, resulting in no net movement of water.

Front

Describe exocytosis.

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

Front

What is the significance of concentration gradients in cellular transport?

Back

Concentration gradients drive the movement of substances across membranes, with molecules moving from areas of high concentration to low concentration in passive transport.