This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Intracellular vesicle targeting, docting and fusion is done by which of the following 
Select and explain. 
A. Rho, B. P 2 x 3, C. Rab, D. Ras
C: Rab
Answer: C: Rab 
Explanation: Ans: C. RabSmall GTPase family:G proteins are divided into two groups, with a major family being thesmall G proteins or small GTPases (20 - 40 kDa).Rab functions: Intracellular vesicle targeting. docking and fusion.