Cell Transport

Front

What is cell transport?

Back

Cell transport refers to the movement of substances across the cell membrane, which can occur through various mechanisms such as diffusion, facilitated diffusion, and active transport.

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 is diffusion?

Back

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

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which large or polar molecules cross the cell membrane with the help of transport proteins, moving from high to low concentration without using energy.

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What is active transport?

Back

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

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf large molecules or particles by wrapping them in a membrane vesicle to bring them into the cell.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel large molecules or particles by fusing a vesicle with the cell membrane, releasing its contents outside the cell.

Front

What role do proteins play in cell transport?

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Proteins act as channels or carriers in the cell membrane, facilitating the transport of large or charged molecules across the membrane.

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What is the difference between facilitated diffusion and active transport?

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Facilitated diffusion 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.