How are the parts of dna like a book?

DNA stores information that can be copied and passed on.

The deoxyribonucleic acid is like a book because it carries genetic instruction used for growth and development and all that funky stuff and if you talk about a book in a library then it can make an entire living organism (the library is the organism). Pretty sure but that's from the top of my head and it has been a year since I have done Biology but hey the only thing I passed in Science 

There is someone thing called molecules and the type is changed