In reference to the Bible we do not believe any books remain as they were originaly revealed. Although we do find some true phrases in several of the books. Those phrases also exist in the Qur'an.
Now for the make up of the Qur'an. The literary divisions do not exist in terms of English book divisions.
The Qur'an is a single book. There are divisions that do have rough counter parts in English methodology. the divisions exist for various puposes. One of the divisions is called a Juz that is roughly 1/30 of the Qur'an We strive to read one Juz per day so by the end of each month we have read the entire Qur'an.
Another division is called Surah's, Each Surah was revealed at a different time and covers different facets of Islam, People, events etc. This corresponds roughly with a Chapetr. But differs in the sense that none are seperate from the others and each has some overlap with all of the others.
There are 114 Surahs all of unequal lengths.
The next division is called an Ayyat it is usually a single line, but it can be several lines or even a paragraph.