Why don't you tell us your understanding of them first? That way we can help you fix any misconceptions or fill in the blanks.
I am studying molecular biology and my understanding is that it is the study of biological molecules, their interactions and purpose.
Cell Physiology is something that is about the engineering of the cell, basically study of biological cells.
Cell biology, inner working of the cells, and all their systems.. same as cell physiology as far as I can tell?