Can a cell survive without the smooth endoplasmic reticulum?

Yes , A cell would survive normally and even a bit more healthier since all the smooth (ER) does is slow the cell down and create useless fats only eatable by donkies.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.