Cell transport

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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, using energy (ATP).

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What is Passive Transport?

Back

Passive Transport is the movement of molecules across a cell membrane without the use of energy, moving from an area of higher concentration to an area of lower concentration.

Front

Define Osmosis.

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is Exocytosis?

Back

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

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What is Endocytosis?

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Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle.

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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 without energy.

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What is the role of ATP in Active Transport?

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ATP provides the energy required for Active Transport to move substances against their concentration gradient.

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What is the difference between Simple Diffusion and Facilitated Diffusion?

Back

Simple Diffusion is the movement of small or nonpolar molecules directly through the lipid bilayer, while Facilitated Diffusion requires specific protein channels for larger or polar molecules.

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What does 'high to low concentration' mean in the context of Passive Transport?

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'High to low concentration' refers to the natural movement of molecules from an area where they are more concentrated to an area where they are less concentrated, which does not require energy.

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What is a selectively permeable membrane?

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A selectively permeable membrane is a barrier that allows certain substances to pass through while blocking others, crucial for maintaining homeostasis in cells.