I assume DKC is Donkey Kong Country. You probably want to spell such things out though as not everybody will use such abbreviations and there may be more than one (is GOW god of war or gears of war?).
Second question if so is what system? Donkey Kong Country appeared in non emulated form on the SNES, GBC and GBA and all three (though maybe less for the GBC) have been the target for hackers making some fairly extensive changes over the years.http://adshomebrewersdiary.blogspot.co.uk/2012/02/unequivocal-answer.html
for the DS covers some of the methods seen on later systems. Generally though you will want to look for DMA (direct memory access, used so you don't tie up the CPU fetching data and in most systems save for the oldest and simplest) and for any CPU instructions which can fetch data (usually easier than DMA but you tie up the CPU when you are doing it).
Going further if you know where something is in the ROM you can find a debugging emulator for that system and set a break on read (bpr) for that location. When said location is read the emulator will halt (or log if you set that) and tell you want instruction/method is reading it and the instructions leading to that. A simpler, but less effective, thing can be done by searching for the data you know in the ROM in the RAM. As processing data is expensive most things tend to be fairly similar in the ROM to how they end up in the RAM, though things like compression can get in the way of that.
Unless you did not mean the means by which they are loaded and instead where the stuff is found in RAM. This can be tricky and things tends to be swapped in and out which makes conventional cheats more of a pain. Though if you are going with a lua supporting emulator or a RAM fiddling program which has some logic it can use then so it goes.http://datacrystal.romhacking.net/wiki/Donkey_Kong_Country:RAM_map
does not appear to have much, https://web.archive.org/web/20090914001029/http://giangurgolo.home.att.net:80/dkc/bytes_levels.txt
for the broken link at the end of that.
Also by objects do you mean pickups and such? Looking at http://www.dkc-atlas.com/forum/viewtopic.php?f=38&t=522
it does appear to be the term used within Donkey Kong Country hacking circles. I don't know what they will do in RAM though as there are various means of making levels within games and those can change with scrolling games too (often things get streamed just for that screen and the immediate surroundings).