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What is passive transport?

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Passive transport is the movement of substances across a cell membrane without the use of energy by the cell. It occurs along the concentration gradient, from an area of higher concentration to an area of lower concentration.

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What is active transport?

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Active transport is the movement of substances across a cell membrane against the concentration gradient, requiring energy (usually in the form of ATP).

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What is endocytosis?

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Endocytosis is the process by which cells take in large molecules or particles by engulfing them in a membrane-bound vesicle.

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What is exocytosis?

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Exocytosis is the process by which cells expel large molecules or particles by vesicles fusing with the cell membrane and releasing their contents outside the cell.

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What are fatty acids?

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Fatty acids are long hydrocarbon chains that are key components of lipids, such as triglycerides and phospholipids, and are important for energy storage and cell membrane structure.

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What is glycerol?

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Glycerol is a three-carbon molecule that forms the backbone of triglycerides and phospholipids, serving as a structural component in lipids.

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What is facilitated diffusion?

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Facilitated diffusion is a type of passive transport that uses specific transport proteins to help move substances across the cell membrane without energy.

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What is a channel protein?

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Channel proteins are integral membrane proteins that form pores in the cell membrane, allowing specific ions or molecules to pass through.

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What is a carbohydrate chain?

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Carbohydrate chains are long chains of sugar molecules that are often attached to proteins or lipids on the cell surface, playing a role in cell recognition and signaling.

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What is the concentration gradient?

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The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of substances during diffusion.