Cell Membrane & Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically along a concentration gradient.

Front

What is active transport?

Back

Active transport is the process of moving materials across a cell membrane against a concentration gradient, requiring energy.

Front

What does 'bilayer' refer to in cell membranes?

Back

'Bilayer' refers to the structure of the cell membrane, consisting of two layers of phospholipids.

Front

What is the function of the cell membrane?

Back

The cell membrane controls what substances can enter or leave the cell, helping to maintain homeostasis.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space.

Front

What role do protein channels play in transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane, especially during facilitated diffusion.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane, while facilitated diffusion requires protein channels to help transport molecules.