Which of the following is an example of a transport protein?

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Multiple Choice

Which of the following is an example of a transport protein?

Transport proteins move substances from one place to another by binding and releasing them as they travel. Hemoglobin fits this role because it carries oxygen through the bloodstream: it binds oxygen in the lungs, where oxygen is abundant, and releases it in tissues where it’s needed. This protein uses iron-containing heme groups to bind oxygen, and its cooperative binding helps efficiently pick up oxygen and unload it where required. The other proteins serve different functions: antibodies defend against pathogens by binding antigens, insulin acts as a signaling hormone to regulate glucose, and actin provides structural support and drives cell movement. So, hemoglobin best exemplifies a transport protein among these options.

Transport proteins move substances from one place to another by binding and releasing them as they travel. Hemoglobin fits this role because it carries oxygen through the bloodstream: it binds oxygen in the lungs, where oxygen is abundant, and releases it in tissues where it’s needed. This protein uses iron-containing heme groups to bind oxygen, and its cooperative binding helps efficiently pick up oxygen and unload it where required. The other proteins serve different functions: antibodies defend against pathogens by binding antigens, insulin acts as a signaling hormone to regulate glucose, and actin provides structural support and drives cell movement. So, hemoglobin best exemplifies a transport protein among these options.

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