Active & Passive Transport

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What is Active Transport?

Back

A process that requires energy to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.

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What is Passive Transport?

Back

The movement of molecules across a cell membrane without the use of energy, typically along the concentration gradient.

Front

What is ATP?

Back

Adenosine triphosphate, the energy currency of the cell that provides energy for active transport.

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What is a Phospholipid Bilayer?

Back

A double layer of phospholipids that makes up the cell membrane, providing a barrier to most water-soluble substances.

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What does Semi-permeable mean?

Back

A property of membranes that allows some substances to pass through while blocking others.

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What are Channel Proteins?

Back

Proteins that form pores in the cell membrane, allowing specific molecules to pass through by facilitated diffusion.

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What are Carrier Proteins?

Back

Proteins that bind to specific molecules and change shape to shuttle them across the membrane.

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What is Osmosis?

Back

The diffusion of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is the difference between Active and Passive Transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

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What is a Concentration Gradient?

Back

A difference in the concentration of a substance across a space or membrane.