a) In the Bible, Adam is told not to eat from the tree, while the Koran says that he and his mate should not draw near the tree (this is a transformation of biblical content in the Koran).

b) In the Bible the tree is called “the tree of the knowledge of good and evil”, while in the Koran it is just called “this tree”, as though it were known (this is an omission of biblical content in the Koran). No other reference in the Koran explains, what “this tree” is, with one exception: In Sura 20:120 it is Satan and not Allah, who wants to point out to Adam “the tree of eternity and of a kingdom that will not decay”. Adam and his mate eat of it and their nakedness is revealed to them (Sura 20:121). If you take this koranic verse into consideration, then you have a replacement of biblical content in the Koran: the biblical “tree of the knowledge of good and evil” was replaced in the Koran by a non-biblical “tree of eternity and of a kingdom that will not decay”. The latter may be a corrupted version of what the Bible calls “the tree of life” in Genesis 2:9 and 3:22, where this tree is qualified as imparting the ability to “live forever”. This tree of life, which plays a very important role in the Bible, was totally omitted in the Koran.