These 106 in-depth tutorials are designed to illustrate and explain some of the many complex topics in biology. Each tutorial has four elements: an introduction that describes the topic to be illustrated and puts it into a broader context, a detailed animation that clearly illustrates the topic (there are a few tutorials that include simulations or other types of content, rather than animations), a conclusion that summarizes what you should have learned from the animation, and a quiz on the topic covered. The clear presentation of complex topics make these tutorials a powerful learning tool, be sure to work through them in their entirety for the best benefit. New to the Seventh Edition are 20 Key Experiment tutorials that expand upon some of the most important experiments depicted in the book, as well as 10 additional new tutorials. All the animated activities include textbook references, making it easy for you to look up a topic in the text for further explanation. For details on how the tutorials work, click the Help button on the Animation tab of a tutorial.

Note: An 'E' indicates an experiment tutorial. These correspond to experiment figures in the textbook.

Chapter 1: An Evolutionary Framework for Biology

PART ONE The Cell

Chapter 2: Life and Chemistry: Small Molecules

• Tutorial 2.1 Chemical Bond Formation

Chapter 3: Life and Chemistry: Large Molecules

• Tutorial 3.1 (E) Synthesis of Prebiotic Molecules in an Experimental Atmosphere
• Tutorial 3.2 Macromolecules
• Tutorial 3.3 (E) Pasteur's Experiment

Chapter 4: The Basic Units of Life

• Tutorial 4.1 Eukaryotic Cell Tour
• Tutorial 4.2 The Golgi Apparatus

Chapter 5: Cellular Membranes

• Tutorial 5.1 Passive Transport
• Tutorial 5.2 Active Transport
• Tutorial 5.3 Receptor-Mediated Endocytosis

Chapter 6: Energy, Enzymes, and Metabolism

• Tutorial 6.1 Enzyme Catalysis
• Tutorial 6.2 Allosteric Regulation of Enzymes

Chapter 7: Cellular Pathways That Harvest Chemical Energy

• Tutorial 7.1 Electron Transport and ATP Synthesis
• Tutorial 7.2 (E) Two Experiments Demonstrate the Chemiosmotic Mechanism

Chapter 8: Photosynthesis: Energy from the Sun

• Tutorial 8.1 (E) The Source of the Oxygen Produced by Photosynthesis
• Tutorial 8.2 Photophosphorylation
• Tutorial 8.3 (E) Tracing the Pathway of CO₂

Chapter 9: Chromosomes, the Cell Cycle, and Cell Division

• Tutorial 9.1 Mitosis
• Tutorial 9.2 Meiosis

PART TWO Information and Heredity

Chapter 10: Genetics: Mendel and Beyond

• Tutorial 10.1 Independent Assortment of Alleles
• Tutorial 10.2 (E) Alleles That Do Not Sort Independently

Chapter 11: DNA and Its Role in Heredity

• Tutorial 11.1 (E) The Meselson-Stahl Experiment
• Tutorial 11.2 DNA Replication, Part 1: Replication of a Chromosome and DNA Polymerization
• Tutorial 11.3 DNA Replication, Part 2: Coordination of Leading and Lagging Strand Synthesis

Chapter 12: From DNA to Protein: Genotype to Phenotype

• Tutorial 12.1 Transcription
• Tutorial 12.2 (E) Deciphering The Genetic Code
• Tutorial 12.3 Protein Synthesis

Chapter 13: The Genetics of Viruses and Prokaryotes

• Tutorial 13.1 The lac Operon
• Tutorial 13.2 The trp Operon

Chapter 14: The Eukaryotic Genome and Its Expression

• Tutorial 14.1 RNA Splicing
• Tutorial 14.2 Initiation of Transcription

Chapter 15: Cell Signaling and Communication

• Tutorial 15.1 Signal Transduction Pathway

Chapter 16: Recombinant DNA and Biotechnology

• Tutorial 16.1 Separating Fragments of DNA by Gel Electrophoresis
• Tutorial 16.2 DNA Chip Technology

Chapter 17: Molecular Biology and Medicine

• Tutorial 17.1 (E) DNA Testing by Allele-Specific Cleavage
• Tutorial 17.2 Sequencing the Genome

Chapter 18: Natural Defenses against Disease

• Tutorial 18.1 Cells of the Immune System
• Tutorial 18.2 Pregnancy Test
• Tutorial 18.3 Cellular Immune Response
• Tutorial 18.4 Humoral Immune Response
• Tutorial 18.5 A B-Cell Builds an Antibody

PART THREE Development

Chapter 19: Differential Gene Expression in Development

• Tutorial 19.1 Embryonic Stem Cells
• Tutorial 19.2 (E) Early Asymmetry in the Embryo
• Tutorial 19.3 Pattern Formation in the Drosophila Embryo

Chapter 20: Animal Development: From Genes to Organism

• Tutorial 20.1 Gastrulation
• Tutorial 20.2 (E) Tissue Transplants Reveal the Process of Determination

Chapter 21: Development and Evolutionary Change

• Tutorial 21.1 Modularity

PART FOUR Evolutionary Processes

Chapter 22: The History of Life on Earth

• Tutorial 22.1 Evolution of the Continents

Chapter 23: The Mechanisms of Evolution

• Tutorial 23.1 Natural Selection
• Tutorial 23.2 The Hardy-Weinberg Equilibrium
• Tutorial 23.3 (E) Assessing the Costs of Adaptations

Chapter 24: Species and Their Formation

• Tutorial 24.1 Speciation Mechanisms
• Tutorial 24.2 Founder Events Lead to Allopatric Speciation

Chapter 25: Reconstructing and Using Phylogenies

Chapter 26: Molecular and Genomic Evolution

PART FIVE The Evolution of Diversity

Chapter 27: Bacteria and Archaea: The Prokaryotic Domains

• Tutorial 27.1 The Evolution of the Three Domains

Chapter 28: Protists and the Dawn of the Eukarya

• Tutorial 28.1 (E) Food Vacuoles Handle Digestion and Excretion
• Tutorial 28.2 Family Tree of Chloroplasts

Chapter 29: Plants Without Seeds: From Sea to Land

• Tutorial 29.1 Life Cycle of a Moss

Chapter 30: The Evolution of Seed Plants

• Tutorial 30.1 Life Cycle of a Conifer

Chapter 31: Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

• Tutorial 31.1 Life Cycle of a Zygomycete

Chapter 32: Animal Origins and the Evolution of Body Plans

• Tutorial 32.1 Life Cycle of a Cnidarian

Chapter 33: Ecdysozoans: The Molting Animals

Chapter 34: Deuterostomate Animals

• Tutorial 34.1 Life Cycle of a Frog

PART SIX The Biology of Flowering Plants

Chapter 35: The Plant Body

• Tutorial 35.1 Secondary Growth: The Vascular Cambium

Chapter 36: Transport in Plants

• Tutorial 36.1 The Pressure Flow Model

Chapter 37: Plant Nutrition

• Tutorial 37.1 Nitrogen and Iron Deficiencies

Chapter 38: Regulation of Plant Growth

• Tutorial 38.1 Tropisms
• Tutorial 38.2 (E) Went's Experiment
• Tutorial 38.3 (E) Auxin Affects Cell Walls

Chapter 39: Reproduction in Flowering Plants

• Tutorial 39.1 Double Fertilization
• Tutorial 39.2 (E) The Effect of Interrupted Days and Nights

Chapter 40: Plant Responses to Environmental Challenges

• Tutorial 40.1 Signaling between Plants and Pathogens

PART SEVEN The Biology of Animals

Chapter 41: Physiology, Homeostasis, and Temperature Regulation

• Tutorial 41.1 Control, Regulation, and Feedback

Chapter 42: Animal Hormones

• Tutorial 42.1 Complete Metamorphosis
• Tutorial 42.2 Hypothalamic-Pituitary-Endocrine Axis
• Tutorial 42.3 Hormonal Regulation of Calcium

Chapter 43: Animal Reproduction

• Tutorial 43.1 Fertilization in the Sea Urchin
• Tutorial 43.2 The Ovarian and Uterine Cycles

Chapter 44: Neurons and Nervous Systems

• Tutorial 44.1 The Resting Membrane Potential
• Tutorial 44.2 The Action Potential
• Tutorial 44.3 Synaptic Transmission

Chapter 45: Sensory Systems

• Tutorial 45.1 Sound Transduction in the Human Ear
• Tutorial 45.2 (E) Information Processing in the Retina

Chapter 46: The Mammalian Nervous System: Structure and Higher Functions

• Tutorial 46.1 Information Processing in the Spinal Cord

Chapter 47: Effectors: Making Animals Move

• Tutorial 47.1 Molecular Mechanism of Muscle Contraction
• Tutorial 47.2 (E) Smooth Muscle Action

Chapter 48: Gas Exchange in Animals

• Tutorial 48.1 Airflow in Birds
• Tutorial 48.2 Airflow in Mammals

Chapter 49: Circulatory Systems

• Tutorial 49.1 The Cardiac Cycle

Chapter 50: Nutrition, Digestion, and Absorption

• Tutorial 50.1 The Digestion and Absorption of Fats
• Tutorial 50.2 Insulin and Glucose Regulation

Chapter 51: Salt and Water Balance and Nitrogen Excretion

• Tutorial 51.1 The Mammalian Kidney

Chapter 52: Animal Behavior

• Tutorial 52.1 Hormonal Control of Sexual Behavior
• Tutorial 52.2 (E) Circadian Rhythms
• Tutorial 52.3 Time-Compensated Solar Compass

PART EIGHT Ecology and Biogeography

Chapter 53: Behavioral Ecology

• Tutorial 53.1 (E) The Costs of Defending a Territory
• Tutorial 53.2 Foraging Behavior

Chapter 54: Population Ecology

• Tutorial 54.1 Exponential Growth Simulation
• Tutorial 54.2 Logistic Growth Simulation
• Tutorial 54.3 Predator-Prey Simulation
• Tutorial 54.4 Habitat Fragmentation

Chapter 55: Communities and Ecosystems

• Tutorial 55.1 Primary Succession on a Glacial Moraine

Chapter 56: Biogeography

• Tutorial 56.1 Rain Shadow
• Tutorial 56.2 Biomes
• Tutorial 56.3 Biogeography Simulation

Chapter 57: Conservation Biology

Chapter 58: Earth System Science

• Tutorial 58.1 The Global Hydrological Cycle
• Tutorial 58.2 The Global Carbon Cycle
• Tutorial 58.3 The Ocean Conveyor Belt
• Tutorial 58.4 The Global Nitrogen Cycle