Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that allows molecules to cross the cell membrane with the help of transport proteins, moving from an area of high concentration to an area of low concentration without the use of energy.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (usually in the form of ATP) to do so.

Front

What are phospholipids?

Back

Phospholipids are a type of lipid molecule that make up the majority of the cell membrane, consisting of a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails'.

Front

What role do proteins play in cell transport?

Back

Proteins act as channels or pumps in the cell membrane, facilitating the movement of molecules across the membrane, either passively (facilitated diffusion) or actively (active transport).

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances from high to low concentration, while active transport requires energy to move substances from low to high 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 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 during diffusion.

Front

What is the function of transport proteins?

Back

Transport proteins assist in the movement of substances across the cell membrane, either by providing a passageway for molecules to diffuse through or by actively transporting them against a concentration gradient.

Front

What is the significance of the cell membrane's fluid mosaic model?

Back

The fluid mosaic model describes the cell membrane as a flexible structure with various proteins embedded in or attached to a double layer of phospholipids, allowing for dynamic interactions and movement.

Front

What is endocytosis?

Back

Endocytosis is a process by which cells engulf substances from their external environment, forming a vesicle to bring the substance into the cell.