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Either; they're identical to the units of $N(0)$. In $N =N(0) e^{kt}$, $t$ has units of time (days, minutes, whatever you have chosen) $k$ has units of (1/time) (inverse of $t$'s units) $kt$ is thus unitless, as is $e^{kt}$ $N$ and $N(0)$ have the same units.


For the media bottle, it is better to keep the cap a bit loose to avoid to pressure inside the bottle. A good way is to had autoclaving tape on the side so that it is clear that the bottle has been autoclaved. As Chris mentionned below once autoclaved, use gloves, and close the bottle firm after you open the autoclave and do not wait until it has cooled down ...

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