Can I boot my G4 533mhz PPC from a USB external?

My disk utility shows my hard drive to be "FAILING" in red. I have purchased a Seagate Expansion External USB Hard Drive and using SuperDuper! cloned my hard drive to the external. Side-by-side comparisons of both drives in Finder appear to show that all files were copied/cloned to the external drive.
In System Preferences/Start-up Disk the current drive OSX (10.4.11) and OS9 are given as booting options and the OS9 on the external hard drive is also an option but OSX is not an option to boot from the external new drive.
I do not have the Install Disks for OSX (10.4.11). My questions are:
1.) Is it possible to boot a PPC from a USB (2.0) drive?
2.) How can I boot in to OSX from the external drive (use the external drive as my boot-up disk)?
3.) What are my options---any advice?
Thanks

Hi, rossirebel -
...because the seagate drive was not given as an option under the system preferences/start-up disk, so I did not think it would work.
The choices given in System Preference's Startup Disk are governed by the perception of the OS, i.e. by how the current operating system has been coded. In that sense it is relative.
However, Startup Manager is a fully hardware-based function. It runs before any OS or other software has been loaded from any drive, and its choices are based solely on the capabilities of the machine. In that sense it is absolute.
Startup Manager is coded smart, too. If your hard drive has been partitioned and set up into more than one bootable volume, Startup Manager will offer separate icons for all of the partitions which are bootable - it views them as discrete volumes.
One negative aspect, but workable once you know the limitation - if you have more than one OS on a single volume (such as OS 9 and OSX on a dual-boot machine), it will display only the OS last booted to for that volume.

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