If the cost of the Miesfeld text is prohibitive, ask your professor if they can recommend Open Educational Resources. There are excellent, peer-reviewed, completely free biochemistry textbooks available online (such as Biochemistry by Berg, Tymoczko, Gatto, and Stryer via the NCBI Bookshelf, though licensing varies) that can serve as supplementary study aids.
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Key features that make this textbook a staple in modern curricula include: If the cost of the Miesfeld text is