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
Transpo of neutral substances across the cell membrane occurs 
Select and explain. 
A. Porins, B. Lonophore, C. Lipopolysaccharides, D. Diffusion
D: Diffusion
Answer: D: Diffusion 
Explanation: D i.e. DiffusionTranspo simple passive diffusion is oured by small size, lipid solubility (hydrophobicity) absence of charge (neutrality), and absence of polarity (nonpolar nature)Q.