In an experiment to study the effect of ultraviolet light on bacteria, it was concluded that ultraviolet light has a sterilizing effect on bacteria. which of these observations could have led to this conclusion? a) ultraviolet light stopped the replication process of bacteria. b) bacterial colonies exposed to ultraviolet light continued to replicate. c) bacterial colonies exposed to ultraviolet light became resistant over time. d) ultraviolet light increased the rate of binary fission in the bacterial cells.