Essential Biochemistry

Citation

Pratt, C. W., & Cornely, K. (2021). Essential Biochemistry (5th ed.). Wiley.

Chapter Summary

The fifth edition (March 2021, about 816 pages) has twenty-two chapters in four parts, followed by a glossary, solutions to the odd-numbered problems and an index. Chapter 1 explains the plan: after two foundation chapters, Chapters 3–22 fall into three groups matching three themes of biochemistry, namely the link between molecular structure and function, the acquisition and use of energy, and the transmission of biological information. Each chapter opens with "Do You Remember?" review questions and learning objectives, and closes with a summary, key terms, a long set of problems arranged in pairs, and annotated selected readings. Many chapters contain a "Clinical Connection" section, several include a "Tools and Techniques" section, and short boxes add applications.

Part 1: Foundations (Chapters 1–2)

Chapter 1: The Chemical Basis of Life previews the subject in three sections: the main kinds of biological molecules and their polymers, the thermodynamics of metabolism (enthalpy, entropy, free energy), and the origin of cells and the differences between prokaryotes and eukaryotes, including the microorganisms of the human body. It also lists the book's themes, among them homeostasis, evolution and the biochemical explanation of disease. Chapter 2: Aqueous Chemistry covers hydrogen bonding and water as a solvent, the hydrophobic effect and lipid bilayers, and acid–base chemistry (pH and pK), ending with buffers and acid–base balance in humans.

Part 2: Molecular Structure and Function (Chapters 3–11)

Chapter 3: Nucleic Acid Structure and Function comes before proteins: nucleotides, the double helix, the central dogma, mutation and disease, genetically modified organisms and genomics. Chapter 4: Protein Structure runs from amino acids through secondary, tertiary and quaternary structure, folding and intrinsically disordered proteins, with protein misfolding disease and protein analysis (chromatography, mass spectrometry). Chapter 5: Protein Function treats myoglobin and hemoglobin and their variants, structural proteins such as actin and collagen, motor proteins (myosin and kinesin) and antibodies.

Chapter 6: How Enzymes Work describes catalytic mechanisms and what makes enzyme catalysis special, using chymotrypsin as the worked case and blood coagulation as the clinical connection. Chapter 7: Enzyme Kinetics and Inhibition derives the Michaelis–Menten model and covers types of inhibition, with a clinical section on drugs. Chapters 8–10: Lipids and Membranes; Membrane Transport; Signaling move from lipid structure, the bilayer, membrane proteins and the fluid mosaic model to passive and active transport and membrane fusion, then to G protein pathways, receptor tyrosine kinases and lipid hormone signaling. Chapter 11: Carbohydrates covers monosaccharides, polysaccharides and glycoproteins, with boxes on the Maillard reaction, cellulosic biofuel and the ABO blood groups.

Part 3: Metabolism (Chapters 12–19)

Chapter 12: Metabolism and Bioenergetics introduces food and fuel, metabolic pathways, oxidation–reduction and free energy changes, and the overview figures of metabolism that recur in later chapters. Chapter 13: Glucose Metabolism covers glycolysis, gluconeogenesis, glycogen synthesis and degradation and the pentose phosphate pathway, with disorders of carbohydrate metabolism. Chapters 14–15: The Citric Acid Cycle; Oxidative Phosphorylation take the pyruvate dehydrogenase reaction, the eight reactions of the cycle and its anabolic and catabolic roles, then mitochondrial electron transport, chemiosmosis and ATP synthase. Chapter 16: Photosynthesis treats chloroplasts, the light reactions and carbon fixation, with the C4 pathway in a box.

Chapter 17: Lipid Metabolism covers lipid transport, fatty acid oxidation and synthesis and the synthesis of other lipids. Chapter 18: Nitrogen Metabolism runs from nitrogen fixation and assimilation through amino acid biosynthesis and catabolism and the urea cycle to nucleotide metabolism. Chapter 19: Regulation of Mammalian Fuel Metabolism integrates the pathways, explains their hormonal control and disorders of fuel metabolism, and ends with cancer metabolism.

Part 4: Genetic Information (Chapters 20–22)

Chapter 20: DNA Replication and Repair covers the replication machinery, telomeres, DNA damage and repair, cancer as a genetic disease, DNA packaging and tools for manipulating DNA, with a box on CRISPR gene editing. Chapter 21: Transcription and RNA covers initiating transcription, RNA polymerase and RNA processing. Chapter 22: Protein Synthesis covers tRNA and the genetic code, ribosome structure, translation and post-translational events such as chaperone-assisted folding, membrane targeting and covalent modification.

Key Concepts

Foundations and structure (Chapters 1–11)

• Free energy (ΔG): the quantity that decides whether a process is spontaneous, introduced in Chapter 1 and used throughout metabolism.
• Hydrophobic effect: the main force stabilizing folded proteins and lipid bilayers.
• pK and buffers: how acids ionize and how solutions resist pH change.
• Levels of protein structure: primary to quaternary, plus intrinsically disordered regions.
• Cooperative oxygen binding: hemoglobin's response to oxygen, H⁺ and bisphosphoglycerate.
• Catalytic mechanisms and Michaelis–Menten kinetics: how enzymes speed reactions and how their rates and inhibition are measured.
• Fluid mosaic model and membrane transport: membrane organization and how solutes cross it passively or actively.
• Signal transduction: G protein pathways, receptor tyrosine kinases and lipid hormones.

Metabolism (Chapters 12–19)

• Metabolic pathways and redox reactions: the organization of catabolism and anabolism.
• Glycolysis, gluconeogenesis and glycogen metabolism: the handling of glucose.
• Chemiosmosis and ATP synthase: how electron transport is coupled to ATP synthesis.
• Carbon fixation: rubisco and the incorporation of CO₂ in photosynthesis.
• Urea cycle: the disposal of excess nitrogen.
• Hormonal control of fuel metabolism: how the body coordinates pathways between organs.

Genetic information (Chapters 20–22)

• Replication and repair: copying DNA accurately and correcting damage.
• Transcription and RNA processing: making and modifying RNA.
• Translation and post-translational events: protein synthesis on the ribosome and what happens to proteins afterwards.

Critical Analysis

Strengths

• Built for active study. The publisher describes a strategy of posing questions and suggesting study activities throughout each chapter. The sample chapter shows the apparatus: opening review questions linking to earlier material, learning objectives for each section, questions attached to figures, a summary and key-term list, and dozens of problems (Chapter 1 alone has 68), with solutions to the odd-numbered ones at the back.
• Broad but controlled coverage. Wiley describes coverage as broad but not overwhelming, focused on the chemistry behind biology, and aimed at biology, pre-medical and allied-health students. The table of contents bears this out: twenty-two chapters reach photosynthesis, signaling, nucleotide metabolism and cancer metabolism without the length of a major reference text.
• Clinical and practical connections built into the structure. Clinical Connection sections (acid–base balance, protein misfolding, hemoglobin variants, coagulation, drug design, carbohydrate disorders, cancer) and Tools and Techniques sections (buffers, protein analysis, DNA manipulation) are numbered sections rather than optional sidebars, and boxes connect topics to everyday matters such as sports drinks, baking and herbicides.
• Current reading lists. Each chapter's annotated selected readings point to recent short papers; five of the six items in Chapter 1's list date from 2015–2020.

Limitations

• Still a long book. At about 816 pages it is shorter than the major texts but more than one semester can cover in full; selection is necessary.
• Nucleic acid structure before proteins, genetic processes at the end. Chapter 3 introduces nucleic acids early, but replication, transcription and translation wait until Chapters 20–22. Courses that teach molecular biology elsewhere may skip these; courses that want information flow early will need to reorder.
• Chemistry-forward approach. The stated focus on the chemistry behind biology, with reaction mechanisms (Chapter 6 includes a box on depicting reaction mechanisms), thermodynamics and pK calculations from the first chapters, asks students to be comfortable with general and some organic chemistry.

Where It Fits in the Course

In this biochemistry course list Essential Biochemistry is the problem-centred choice for a first course. Its nearest alternative is McKee and McKee's Biochemistry: The Molecular Basis of Life, a longer one-semester text that stresses the balance of chemistry and biology and the physiology of the cell; Pratt and Cornely are more compact and more systematic in their study apparatus. Biochemistry: A Short Course, derived from Berg, Tymoczko and Stryer, is another one-semester option with clinical examples. Mark Lorch's Biochemistry: A Very Short Introduction and Goodsell's The Machinery of Life are non-technical previews.

For later study, Pratt is also an author of Voet, Voet and Pratt's Fundamentals of Biochemistry, the natural continuation for a full-year course; Miesfeld and McEvoy's Biochemistry, Appling, Anthony-Cahill and Mathews's Biochemistry: Concepts and Connections, Lehninger Principles of Biochemistry and Berg's Biochemistry are the other full treatments. Kuriyan, Konforti and Wemmer's The Molecules of Life and McMurry and Begley's The Organic Chemistry of Biological Pathways deepen the physical-chemistry and mechanism sides.

How to Use This Book

The book suits biology, biochemistry, pre-medical and allied-health students taking a first biochemistry course, typically after general chemistry and at least some organic chemistry. Students weak in acid–base chemistry should give Chapter 2 extra time, since pK and buffer calculations recur.

A practical plan:

• Begin every chapter with "Do You Remember?" If the questions are hard, revisit the earlier chapter they point to before reading on.
• Core sequence for one semester: Chapters 1–2, 4–7 (proteins and enzymes), 8–9 (membranes and transport), 11–15 (carbohydrates through oxidative phosphorylation), then 17–19 (lipid and nitrogen metabolism and the integration of fuel metabolism).
• Optional by programme: Chapter 10 (signaling) for pre-medical and cell biology students; Chapter 16 (photosynthesis) for plant science; Chapters 3 and 20–22 if the course includes molecular biology.
• Use the metabolism overview figures from Chapter 12 onward to place each pathway before learning its steps.

Problems come in pairs: work the odd-numbered problem, check it against the solutions at the back, then attempt its even-numbered partner without help. The Clinical Connection and Tools and Techniques sections are good preparation for case-based and laboratory questions.