Cells

Front

What is Endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell. It involves the membrane folding inward to form a vesicle.

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What are Phospholipids?

Back

Phospholipids are molecules that form the basic structure of cell membranes, consisting of a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails'.

Front

What is Active Transport Pump?

Back

Active Transport Pump is a type of transport mechanism that moves ions or molecules across a cell membrane against their concentration gradient, requiring energy (ATP) to function.

Front

What is Passive Transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients. Examples include diffusion and osmosis.

Front

What is 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.

Front

What is Diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What is Facilitated Diffusion?

Back

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

Front

What is the difference between a cell and a tissue?

Back

A cell is the basic unit of life, while a tissue is a group of cells that work together to perform a specific function.

Front

What is Exocytosis?

Back

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

Front

What is the role of Cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's structure, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.