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Yes, it does. If you're not using an app anymore and don't plan on for awhile, close it out. But say if it's messaging and you're going to get texts throughout the day, then yes it does drain your battery life because it takes more RAM to reopen the app back up again than already having it open in the first place.
 
It doesn't necessarily do it, but it can (more often to a smaller degree though).
 
depends on the app. pos like FB never seems to stop running so its one of those i always end up quitting. its unfortunate u cant tell which is still running like on mac os x
 
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