I have a graphics card that has a standard sized display port(DP). If I purchase a male-to-male display port to mini-display port, will I be able to connect my 27" Thunderbolt display to my PC?
Short answer - No.
You can go from Thunderbolt to DisplayPort, but not the other way round.
You can connect DisplayPort devices to a Thunderbolt port, but you can't connect a Thunderbolt device to DisplayPort.