Experimentation has shown me that HFS+ partitions on APM, GPT, and MBR disks all boot Intel macs.
Experimentation has also shown me that a partition's ability to actually boot has little to do with the ability of the Startup Disk system preference panel's ability to choose it as the boot disk. Usually Startup Disk will allow you to choose any actual bootable partition, but often it will let you choose partitions that cannot actually boot your Mac. For instance I can choose a PPC partition from my Intel Macs Startup Disk prefs, but it will not actually boot my Mac.
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