These were the undergrad books I had on biology:
https://www.amazon.com/Molecular-Biology-Cell-Bruce-Alberts/...
https://www.amazon.com/Biochemistry-Jeremy-M-Berg/dp/1464126...
It costs more but it's worth it. It's a deeply informative book that covers a large spectrum of topics that you can read without much background knowledge in biology. It's the same book your doctor or bioinformatics professional probably used in school learning about cellular biology.
[0] https://www.ncbi.nlm.nih.gov/pubmed/23287718
[1] https://www.amazon.com/Molecular-Biology-Cell-Bruce-Alberts/...