Final answer:
Viruses cannot be distinguished by growth on MacConkey's agar since they require a living host cell to replicate, and thus, the statement is false.
Step-by-step explanation:
False. Infective and non-infective viruses cannot be distinguished by growth on MacConkey's agar. This medium is primarily used for the differentiation of Enterobacteriaceae based on the ability to ferment lactose. Viruses, unlike bacteria, cannot grow on artificial culture media like MacConkey's agar as they require a living host cell for replication. In vitro viral cultivation typically involves the use of cell cultures or embryonated eggs. Therefore, the ability to grow on MacConkey's agar is not a characteristic that can be used to distinguish between infective and non-infective viruses.