Thanks for the replies. I think I might have stated my purpose incorrectly (or I'm understanding what you said wrong)
I have two Arduinos, one is a "master" in a sense, the other a "slave". I would like the slave Arduino's ATMEGA chip to be inactive initially (reset connected to GND), even though it is on the same power supply as the master. My plan to activate the slave Arduino is to connect the transistor partially in the way that retrolefty has described (with emitter to GND and collector to the reset pin), but the base would be connected to an output on the master Arduino and activated by code when needed (opening the connection between reset and GND on the slave).
In other words, I would like the slave Arduino to remain inactive, even though it is powered, until activated by the master.
The way I understood your post, retrolefty, was to have the base connected to a positive voltage constantly through a resistor, bringing reset pin to a low state. However, I am not sure how to bring it back from that state using the master Arduino.
Any suggestions are welcome!