What Type Of Book Is This?

I am a little further through The Selfish Gene, and it just seems to me as if I were reading a book assigned to my Pre AP Biology course! All it talks about is DNA replication, genes, nucleotides and those kind of stuff I learned about a moth ago. It's getting a little frustrating for me because I had some trouble learning this info well explained (there is a lot I still don't understand), well less am I going to get it from a book that just barely quickly talks about the topic. I don't like to be reading a science book in english class! I have read these weird kinds of texts before in class and have learned to read them and analyze them, look at them as texts, books, not what they are. It's like when we read the Bible. I read it as a very important english text, not as a religious book to follow. What is wrong about this book is that you cannot analyze things like "A DNA molecule is a long chain of building blocks, small molecules called nucleotides" (Page 22). There's just npthing metaphorical about it, nothing satyrical or ironic. They are just science facts. The funny thing is I remembered about my biology teacher when I started reading the book, and the next day in class asked her if she had read the book, and she said she was reading it just now! So for my english class i'm reading the same book that my biology teacher is reading, a book filled with science facts.. weird!