Question

describe what a concentration gradient is. why would this be relevant (or important) for cell transport? the process of molecules being broken down; it releases energy. a uniform distribution of molecules; it prevent movement. movement of molecules against their concentration; it requires energy. a difference in concentration between two areas; it drives passive transport.

Explanation:

A concentration gradient is a difference in the concentration of a substance between two areas. In cell transport, it is crucial as it drives passive transport processes like diffusion and osmosis. Passive transport occurs without the need for energy input from the cell. For example, in diffusion, molecules move from an area of higher concentration to an area of lower concentration down the concentration gradient. This helps in the exchange of substances such as oxygen and carbon dioxide across the cell membrane. Osmosis, the diffusion of water, also relies on the concentration gradient of solutes (osmotic gradient). If there is no concentration gradient (a uniform distribution), there would be no net movement of molecules in passive transport processes.

Answer:

A difference in concentration between two areas; it drives passive transport.