Always study with the most up-to-date prep! Look for MCAT Biochemistry Review 2020-2021 , ISBN 978-1-5062-4865-3, on sale July 2, 2019.
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I can't actually give a book about biochemistry 5 stars, because I'm not crazy, so 4 stars it is. But it was very useful, informative, and not that bad. Metabolic processes are complex, but most of the genetics and proteins/enzymes stuff was straightforward.