To turn pages you can tap pages, or drag them if you want, there are actual page animations. (goodereader.com)
I've yet to see the e-book page animations, but my e-books are purchased from Kobo and it's possible that only NOOK Books will support that function. (lifewire.com)
Google has now rolled out the latest version of Google Play Books to the Google Play Store and as noted in the change log, this will be a good release for anyone still using Froyo or Gingerbread as it adds a new UI and 3D page animation. (androidcentral.com)