Cell Membrane & Transport

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, providing protection and support.

Front

Define isotonic solution.

Back

An isotonic solution has the same concentration of solutes as another solution, resulting in no net movement of water across the cell membrane.

Front

What is active transport?

Back

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

Front

Explain facilitated diffusion.

Back

Facilitated diffusion is the process of transporting substances across a cell membrane with the help of transport proteins, without the use of energy.

Front

What are lipids?

Back

Lipids are a group of biological macromolecules that are hydrophobic and include fats, oils, and phospholipids, which are key components of cell membranes.

Front

What is osmosis?

Back

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

Front

Define endocytosis.

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles, releasing them into the external environment.

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane assist in transport, act as receptors, and provide structural support.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion is the passive movement of molecules from high to low concentration, while facilitated diffusion requires specific transport proteins.