USAFRet :
1. It is actually 2 partitions. The main one, and the small System Reserved.
It's 2 partitions and the partition table. The partition table will have a flag saying which partition should be booted if the computer tries to boot off the drive.
If you clone the drive, the table and this flag will get copied over from the old drive, and the SSD will work without any additional steps.
If you just copy partitions, then none of the partitions on the SSD will be flagged as bootable. Your computer will try to boot the SSD, and say "no bootable device found." You have to manually edit the partition table and set the "bootable" flag on the correct partition. System Reserved if it has it, otherwise the partition with Windows if it doesn't. If you have a boot manager installed, it can get more complicated.