Did the Apple II use single-density 5.25" drives?

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I got my first computer, an Apple IIGS back in 1988. I don't recall ever seeing single sided or single density disks in the stores back then. I only ever used double sided, double density (DSDD) disks. Years later I added a SuperDrive and was able to use high density 3.5" disks in it.

I think I read somewhere that the Apple II's 5.25" drives could use single sided, single density disks just fine. Was that true and that the "double density" aspect was wasted?

I know for a fact that they were single sided, and the other side was wasted unless you had a hole-punch tool to remove the write protection on the other side. I also know that MS-DOS systems could use both sides simultaneously. Howver, what about the "single density" aspect?

I've never seen such a disk in either 3.5" or 5.25". I know for a fact that 5.25" high density disks will NOT work in the AppleDisk 5.25" drive, given that somebody traded me a blank HD disk at one point for a formatted ProDOS disk that I was unable to format or use (and he gave me several others from the pack. 

So, were they single density or double density drives?
Did single-density disks even exist, or were they something extremely short lived and quickly replaced with double density the way the 400K disks were replaced with 800K disks on the Mac (400K 3.5" disks was something else I'd only seen as an option with the HFS FST or System 6.0.7 on the Mac).

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