New Mac Pro (Intel) booting a Power Mac (PC) OS

I have the newest version of the Mac Pro G5 and I'd like to know.... if by installing the OS drive from the older PC based G5, can I still access it as a mountable drive and more importantly, can I make it a bootable drive and boot from it, running the older OS ?
The old drive is running 10.5.8.... it's going into the latest Mac Pro G5. My instincts tell me "no" but it sure would be convenient while I grab some things from my older drive.
Thanks!

Welcome and hope you get a lot of fun and enjoyment from your Intel Mac!
No way can you boot from a G5 OS, even the Apple Partition Table has been known to cause trouble, or the presence of the OS.
The Mac Pro is never called by or use "G5" which refers to 5th generation PowerPC.
Best bet is pull the data you want off the drive and initialize it.
Also, using migration assistant is well known for causing so much trouble and mischief, strongly recommended not to use it for apps, just your data, media and preference files (mail, web etc) and do clean install of your apps.
http://discussions.apple.com/thread.jspa?threadID=435350
Even if most apps are Universal Binary, it doesn't take much, not worth the savings, if you do go against instinct, I'd actually make backup images / clones first. May as well get a good backup set with SuperDuper to start off on right foot.
The newest Mac Pro (Intel, Xeon processor "Nehalem"). And your Mac will come with 10.6.2+ build. It would be a stretch (of the imagination) to boot properly.

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