Mutations can only occur during interphase true or false

True.

Interphase is basically the everday functions of the cell. For example, the cell obtains nutrients and metabolizes them, grows, reads its DNA, and conducts other "normal"cell functions. This phase was formerly called the resting phase.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.