I purchased the "Biology Demystified" Book to help in my studies. In going through the book I encountered at least seven scientific inaccuracies or self-contradictions. Usually these contradictions occur between the text and the quizzes or tests.
For example, on page 381 question #88 the test asks, "Literally, this Class is for the birds". The correct multiple choice answer should be "A. Aves". Instead, according to the book the correct answer is "C. Agnatha".
The Agnatha is the subphylum of jawless fishes (found on page 196). Obviously, then this is an error in the book.
Because there are so many errors, it makes it difficult to rely solely on the book for information. However, as a supplemental source this book would be fine as long as you are aware of the mistakes.
The inaccuracies I encountered are listed below.
1. Page 136, Question #4: Incomplete sentence.
2. Page 88, Question #3: Inaccurate definition.
The difference between Prokaryotic and Eukaryotic cells is the presence or lack of membrane-bound organelles.
3. Page 125, paragraph 2 & page 135, Question #2: Self-contradiction.
4. Page 135: Inaccurate fact. The main source of infections are still bacterial rather than fungal (I asked a Doctor.).
5. Page 152 & Page 158, Question #9: Self-contradiction.
6. Page 33 & Page 370, Question #26: Self-contradiction and unclear question. Technically both Francesco Reid and Louis Pasteur threw doubt on the former Theory of Spontaneous Generation.
Error number seven I used as an example.
Personally I was disappointed with the book having so many serious errors in it. If they fix the errors, then this book would be really good. But right now, you have to take it with a tablespoon of salt.
I hope this information helps for those who are considering or have already purchased this book.