Q: Which of the following is not a protein found in plasma?  

Answer: D

Fibronectin is not a plasma protein, but rather an extracellular matrix protein that helps in the binding of collagen and fibrin. On the other hand, albumin, globulin, and fibrinogen are all proteins found in plasma. Albumin is the most abundant plasma protein and is responsible for maintaining the oncotic pressure of the blood, while globulin plays a crucial role in the immune system. Fibrinogen is involved in the blood clotting process and is converted to fibrin during clot formation. Understanding the different plasma proteins and their functions is important in diagnosing and treating various diseases related to the blood.

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