RAM is mobile, in the sense that most laptops use the same kind of RAM. It's 204-pin DDR3-1333MHz PC3-106xx.
CPU isn't (I think). It's standard voltage, not low voltage or ultra-low voltage like in laptops/ultrabooks
HDD is 3.5in. So no, unless you have an SSD, which I'm guessing is 2.5in.
The GPU is a mobile version, I think.
Power cord is... not mobile? I mean, it's sort of your standard power supply cable. I guess laptops use them (some at least). It's mobile in the sense you can unplug it and frolic with it, yeah.