Question
Which is moved by transport proteins?
oxygen
Water
calcium
carbon dioxide
oxygen
Water
calcium
carbon dioxide
Answers
GPT-4o mini
Among the options provided, **calcium** is primarily moved by transport proteins. Calcium ions (Ca²⁺) are regulated in cells and tissues, and their movement across cell membranes often involves specific transport proteins, such as calcium channels and pumps (e.g., the calcium ATPase).
While gases like oxygen and carbon dioxide can diffuse freely across cell membranes, water can move through specialized proteins called aquaporins, but it is also capable of passive diffusion to some extent. Thus, in the context of transport proteins, calcium is the most relevant option.
While gases like oxygen and carbon dioxide can diffuse freely across cell membranes, water can move through specialized proteins called aquaporins, but it is also capable of passive diffusion to some extent. Thus, in the context of transport proteins, calcium is the most relevant option.