Which is a factor that determines whether a molecule can cross a cell membrane?
O A. Size
O B. Weight

C. Speed
O D. Color

The size of the molecule determines that. There are bigger molecules that can't just cross the membrane that is why there are protiens specialized for allowing large molecules that the cell needs. Small molecules like gas molecules can just go in through the phosooholipids and inside because they are very small

haploid cells;