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The OS X boot loader is stored in a file called boot.efi which you can find in /System/Library/CoreServices. It isn't stored in /boot. You can read more about the OS X boot process on Apple's website here: Mac Developer Library - Kernel Programming Guide - The Early Boot Process


There is no specific way to get into BIOS/EFI easily on the Mac. It is possible to get into NVRAM from boot and from a shell (type man nvram) but I am unsure you will be able to do anything there that will have an effect on the new drive. PC manufacturers give access to this because they don't make the operating system. Apple does not because it's software ...

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