Life: The Science of Biology

Citation

Hillis, D. M., Heller, H. C., Hacker, S. D., Hall, D. W., Laskowski, M. J., O'Connell, L. A., & Sadava, D. E. (2023). Life: The Science of Biology (12th ed., Digital Update). Macmillan Learning.

Chapter Summary

The twelfth edition has 57 chapters in nine parts. The 2023 Digital Update lists Lauren O'Connell as an additional author beside Hillis, Heller, Hacker, Hall, Laskowski and Sadava; the 12th edition itself dates from 2020. The publisher says the book aims to give a foundation for later courses and for careers by engaging students through active discovery, a sharp focus on key concepts and contemporary examples. The parts run from chemistry through cells, genes, evolution and diversity to plant and animal function and ecology.

Part One: The Science of Life and Its Chemical Basis (Chapters 1–4)

"Studying Life", "Small Molecules and the Chemistry of Life", "Proteins, Carbohydrates, and Lipids" and "Nucleic Acids and the Origin of Life". The part ends by linking nucleic acids to the origin of life.

Part Two: Cells (Chapters 5–7)

"Cells: The Working Units of Life", "Cell Membranes" and "Cell Communication and Multicellularity".

Part Three: Cells and Energy (Chapters 8–10)

"Energy, Enzymes, and Metabolism", "Pathways that Harvest Chemical Energy" and "Photosynthesis: Energy from Sunlight".

Part Four: Genes, Genomes, and Heredity (Chapters 11–18)

Eight chapters: "The Cell Cycle and Cell Division", "Inheritance, Genes, and Chromosomes", "DNA and Its Role in Heredity", "From DNA to Protein: Gene Expression", "Gene Mutation and Molecular Medicine", "Regulation of Gene Expression", "Genomes" and "Recombinant DNA and Biotechnology".

Part Five: The Processes and Patterns of Evolution (Chapters 19–23)

"Processes of Evolution", "Reconstructing and Using Phylogenies", "Evolution of Genes and Genomes", "Speciation" and "The History of Life on Earth". Genome evolution sits in this part rather than in the genetics part.

Part Six: The Evolution of Diversity (Chapters 24–31)

Eight chapters surveying groups: "Bacteria, Archaea, and Viruses", "The Origin and Diversification of Eukaryotes", "Plants without Seeds: From Water to Land", "The Evolution of Seed Plants", "The Evolution and Diversity of Fungi", "Animal Origins and the Evolution of Body Plans", "Protostome Animals" and "Deuterostome Animals".

Part Seven: Flowering Plants: Form and Function (Chapters 32–37)

"The Plant Body", "Transport in Plants", "Plant Nutrition", "Regulation of Plant Growth", "Reproduction in Flowering Plants" and "Plant Responses to Environmental Challenges".

Part Eight: Animals: Form and Function (Chapters 38–51)

Fourteen chapters: "Physiology, Homeostasis, and Temperature Regulation", "Animal Hormones", "Immunology: Animal Defense Systems", "Animal Reproduction", "Animal Development", "Neurons, Glia, and Nervous Systems", "Sensory Systems", "The Mammalian Nervous System", "Musculoskeletal Systems", "Gas Exchange", "Circulatory Systems", "Nutrition, Digestion, and Absorption", "Salt and Water Balance and Nitrogen Excretion" and "Animal Behavior".

Part Nine: Ecology (Chapters 52–57)

"The Physical Environment and Biogeography of Life", "Populations", "Species Interactions", "Communities", "Ecosystems" and "A Changing Biosphere".

Key Concepts

Parts One–Three

• Chemistry of life: small molecules, then proteins, carbohydrates, lipids and nucleic acids.
• Membranes and cell communication: how cells are bounded and signal, including multicellularity.
• Metabolism: enzymes, energy-harvesting pathways and photosynthesis.

Part Four

• Gene expression and its regulation: from DNA to protein, with a separate chapter on regulation.
• Genomes and recombinant DNA: genome-level thinking and biotechnology.
• Molecular medicine: gene mutation tied to medical applications in the chapter title.

Parts Five–Six

• Phylogenies: reconstructing and using evolutionary trees.
• Speciation and the history of life: how new species arise and the deep timeline.
• Body plans: animal origins and the evolution of body plans introduce the two animal chapters.

Parts Seven–Nine

• Homeostasis: the entry point to animal physiology.
• Plant growth regulation and responses: signals and environmental challenges.
• Populations to the biosphere: the ecological scale from populations and species interactions to a changing biosphere.

Critical Analysis

Strengths

• A fine-grained organisation. Nine parts break the content into clearly labelled blocks, so a course can cover cells and genes (Parts Two to Four) or organismal function (Parts Seven and Eight) without losing track of where it sits in the whole.
• Evolution placed before diversity. Part Five precedes the survey of organisms in Part Six, so phylogenies and speciation are available when groups are introduced.
• Plants and animals treated separately. Two parts are devoted to form and function, one for flowering plants and one for animals.
• Digital package. The publisher offers an e-book and the Achieve platform, and a Digital Update in 2023 refreshed the edition.

Limitations

• Length. At 57 chapters, the book exceeds what a single course can cover, so readers must choose parts.
• Edition and author changes. The 11th edition (2016) had four authors; the 12th has six and the Digital Update seven, and the chapter list differs, so materials written for earlier editions do not line up.
• Plant coverage is split. Plant evolution appears in Part Six and plant function in Part Seven, so readers following plants must move between two parts.

Where It Fits in the Course

Among the general biology books in this course, Life is a comprehensive majors-level text of the same kind as Campbell Biology and Freeman's Biological Science. Campbell is organised in eight units; Freeman emphasises active learning and quantitative skills. Biology 2e from OpenStax covers a similar majors sequence and is free, while Concepts of Biology is a shorter survey for non-majors or a first pass.

Cell Biology by the Numbers and Lodish's Molecular Cell Biology go further into cells than any chapter here: the first teaches through quantities, the second is a cell and molecular biology textbook built around experiments. Read them after Parts Two to Four of Life.

How to Use This Book

The book is for students in an introductory biology sequence for majors and for readers who want a comprehensive reference text. High-school chemistry and biology are the main preparation.

A practical plan:

• Foundation: Parts One to Three (Chapters 1 to 10) give chemistry, cells and energy.
• Core genetics and evolution: Part Four, then Part Five; read them together if the course emphasises evolution.
• By interest: Part Six for diversity, Parts Seven and Eight for physiology, Part Nine for ecology.
• Practice: use the e-book and Achieve materials if the course provides them, and check which edition the course uses before relying on chapter numbers.