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Biology for AP ® Courses SENIOR CONTRIBUTING A UTHORS JULIANNE ZEDALIS , BISHOP 'S SCHOOL JOHN EGGEBRECHT , BROOKLYN TECHNICAL HIGH SCHOOL OpenStax Rice University 6100 Main Street MS -375 Houston, Texas 77005 To learn more about OpenStax, visit http s://openstax.org. Individual print copies and bulk orders can be purchased through our website. ©2018 Rice University
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The Foundation concentrates its resources on activities in education, t he environment, global development and population, performing arts, and philanthropy, and makes grants to support disadvantaged communities in the San Francisco Bay Area. Calvin K
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Kazanjian was the founder and president of Peter Paul (Almond Joy), Inc
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He firmly believed that the more people understood about basic economics the happier and more prosperous they would be
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Accordingly, he established the Calvin K
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Kazanjian Economics Foundation Inc, in 1949 as a philanthropic, nonpolitical educational organ ization to support efforts that enhanced economic understanding. Guided by the belief that every life has equal value, the Bill & Melinda Gates Foundation works to help all people lead healthy, productive lives
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In developing countries, it focuses on imp roving people’s health with vaccines and other life -saving tools and giving them the chance to lift themselves out of hunger and extreme poverty
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In the United States, it seeks to significantly improve education so that all young people have the opportunit y to reach their full potential
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Based in Seattle, Washington, the foundation is led by CEO Jeff Raikes and Co -chair William H
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The future of education. openstax.org When you access College Success in our web view, you can use our new online highlighting and note-taking features to create your own study guides. Our books are free and flexible, forever. Get started at openstax.org/details/books/biology-ap-courses Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Unit 1 Chapter 1: The Study of Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1 The Science of Biology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.2 Themes and Concepts of Biology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Chapter 2: The Chemical Foundation of Life . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 2.1 Atoms, Isotopes, Ions, and Molecules: The Building Blocks . . . . . . . . . . . . . . . 42 2.2 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 2.3 Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Chapter 3: Biological Macromolecules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 3.1 Synthesis of Biological Macromolecules . . . . . . . . . . . . . . . . . . . . . . . . . 88 3.2 Carbohydrates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 3.3 Lipids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 3.4 Proteins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 3.5 Nucleic Acids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Unit 2 Chapter 4: Cell Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 4.1 Studying Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 4.2 Prokaryotic Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 4.3 Eukaryotic Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 4.4 The Endomembrane System and Proteins . . . . . . . . . . . . . . . . . . . . . . . . 166 4.5 Cytoskeleton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 4.6 Connections between Cells and Cellular Activities . . . . . . . . . . . . . . . . . . . . 178 Chapter 5: Structure and Function of Plasma Membranes . . . . . . . . . . . . . . . . . . . 195 5.1 Components and Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 5.2 Passive Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 5.3 Active Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 5.4 Bulk Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 Chapter 6: Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 6.1 Energy and Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 6.2 Potential, Kinetic, Free, and Activation Energy . . . . . . . . . . . . . . . . . . . . . . 242 6.3 The Laws of Thermodynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 6.4 ATP: Adenosine Triphosphate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 6.5 Enzymes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259 Chapter 7: Cellular Respiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 7.1 Energy in Living Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 7.2 Glycolysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 7.3 Oxidation of Pyruvate and the Citric Acid Cycle . . . . . . . . . . . . . . . . . . . . . . 291 7.4 Oxidative Phosphorylation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296 7.5 Metabolism without Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 7.6 Connections of Carbohydrate, Protein, and Lipid Metabolic Pathways . . . . . . . . . . 307 7.7 Regulation of Cellular Respiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 Chapter 8: Photosynthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 8.1 Overview of Photosynthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 8.2 The Light-Dependent Reaction of Photosynthesis . . . . . . . . . . . . . . . . . . . . 336 8.3 Using Light to Make Organic Molecules . . . . . . . . . . . . . . . . . . . . . . . . . . 347 Chapter 9: Cell Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365 9.1 Signaling Molecules and Cellular Receptors . . . . . . . . . . . . . . . . . . . . . . . 366 9.2 Propagation of the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 9.3 Response to the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382 9.4 Signaling in Single-Celled Organisms . . . . . . . . . . . . . . . . . . . . . . . . . . . 386 Chapter 10: Cell Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 10.1 Cell Division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 10.2 The Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408 10.3 Control of the Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419 10.4 Cancer and the Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 10.5 Prokaryotic Cell Division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430Unit 3 Chapter 11: Meiosis and Sexual Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . 445 11.1 The Process of Meiosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446 11.2 Sexual Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456 Chapter 12: Mendel's Experiments and Heredity . . . . . . . . . . . . . . . . . . . . . . . . 469 12.1 Mendel’s Experiments and the Laws of Probability . . . . . . . . . . . . . . . . . . . 470 12.2 Characteristics and Traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477 12.3 Laws of Inheritance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494 Chapter 13: Modern Understandings of Inheritance . . . . . . . . . . . . . . . . . . . . . . 517 13.1 Chromosomal Theory and Genetic Linkages . . . . . . . . . . . . . . . . . . . . . . 518 13.2 Chromosomal Basis of Inherited Disorders . . . . . . . . . . . . . . . . . . . . . . . 524 Chapter 14: DNA Structure and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543 14.1 Historical Basis of Modern Understanding . . . . . . . . . . . . . . . . . . . . . . . . 544 14.2 DNA Structure and Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549 14.3 Basics of DNA Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559 14.4 DNA Replication in Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 562 14.5 DNA Replication in Eukaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 566 14.6 DNA Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 Chapter 15: Genes and Proteins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 15.1 The Genetic Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 15.2 Prokaryotic Transcription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 15.3 Eukaryotic Transcription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604 15.4 RNA Processing in Eukaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610 15.5 Ribosomes and Protein Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615 Chapter 16: Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635 16.1 Regulation of Gene Expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636 16.2 Prokaryotic Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639 16.3 Eukaryotic Epigenetic Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . 645 16.4 Eukaryotic Transcriptional Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . 649 16.5 Eukaryotic Post-transcriptional Gene Regulation . . . . . . . . . . . . . . . . . . . . 653 16.6 Eukaryotic Translational and Post-translational Gene Regulation . . . . . . . . . . . . 657 16.7 Cancer and Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659 Chapter 17: Biotechnology and Genomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677 17.1 Biotechnology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678 17.2 Mapping Genomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 693 17.3 Whole-Genome Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697 17.4 Applying Genomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701 17.5 Genomics and Proteomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704 Unit 4 Chapter 18: Evolution and Origin of Species . . . . . . . . . . . . . . . . . . . . . . . . . . 719 18.1 Understanding Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 720 18.2 Formation of New Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 731 18.3 Reconnection and Rates of Speciation . . . . . . . . . . . . . . . . . . . . . . . . . 743 Chapter 19: The Evolution of Populations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767 19.1 Population Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 768 19.2 Population Genetics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 774 19.3 Adaptive Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 783 Chapter 20: Phylogenies and the History of Life . . . . . . . . . . . . . . . . . . . . . . . . 807 20.1 Organizing Life on Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808 20.2 Determining Evolutionary Relationships . . . . . . . . . . . . . . . . . . . . . . . . . 815 20.3 Perspectives on the Phylogenetic Tree . . . . . . . . . . . . . . . . . . . . . . . . . 826 Unit 5 Chapter 21: Viruses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849 21.1 Viral Evolution, Morphology, and Classification . . . . . . . . . . . . . . . . . . . . . 850 21.2 Virus Infection and Hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 857 21.3 Prevention and Treatment of Viral Infections . . . . . . . . . . . . . . . . . . . . . . 866 21.4 Other Acellular Entities: Prions and Viroids . . . . . . . . . . . . . . . . . . . . . . . 871 Chapter 22: Prokaryotes: Bacteria and Archaea . . . . . . . . . . . . . . . . . . . . . . . . . 889 22.1 Prokaryotic Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890 This OpenStax book is available for free at http://cnx.org/content/col12078/1.622.2 Structure of Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 897 22.3 Prokaryotic Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907 22.4 Bacterial Diseases in Humans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911 22.5 Beneficial Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 919 Unit 6 Chapter 23: Plant Form and Physiology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 945 23.1 The Plant Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 946 23.2 Stems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 948 23.3 Roots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 957 23.4 Leaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 960 23.5 Transport of Water and Solutes in Plants . . . . . . . . . . . . . . . . . . . . . . . . 969 23.6 Plant Sensory Systems and Responses . . . . . . . . . . . . . . . . . . . . . . . . . 979 Unit 7 Chapter 24: The Animal Body: Basic Form and Function . . . . . . . . . . . . . . . . . . . 1017 24.1 Animal Form and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018 24.2 Animal Primary Tissues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1026 24.3 Homeostasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037 Chapter 25: Animal Nutrition and the Digestive System . . . . . . . . . . . . . . . . . . . 1057 25.1 Digestive Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1058 25.2 Nutrition and Energy Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1072 25.3 Digestive System Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1080 25.4 Digestive System Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1087 Chapter 26: The Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1107 26.1 Neurons and Glial Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1108 26.2 How Neurons Communicate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1116 26.3 The Central Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1130 26.4 The Peripheral Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1137 26.5 Nervous System Disorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142 Chapter 27: Sensory Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1165 27.1 Sensory Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1166 27.2 Somatosensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1170 27.3 Taste and Smell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1175 27.4 Hearing and Vestibular Sensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1180 27.5 Vision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1187 Chapter 28: The Endocrine System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1209 28.1 Types of Hormones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1209 28.2 How Hormones Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1213 28.3 Regulation of Body Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1217 28.4 Regulation of Hormone Production . . . . . . . . . . . . . . . . . . . . . . . . . . 1230 28.5 Endocrine Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1232 Chapter 29: The Musculoskeletal System . . . . . . . . . . . . . . . . . . . . . . . . . . . 1257 29.1 Types of Skeletal Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1258 29.2 Bone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1270 29.3 Joints and Skeletal Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1278 29.4 Muscle Contraction and Locomotion . . . . . . . . . . . . . . . . . . . . . . . . . . 1287 Chapter 30: The Respiratory System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1309 30.1 Systems of Gas Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1309 30.2 Gas Exchange across Respiratory Surfaces . . . . . . . . . . . . . . . . . . . . . 1318 30.3 Breathing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1324 30.4 Transport of Gases in Human Bodily Fluids . . . . . . . . . . . . . . . . . . . . . . 1332 Chapter 31: The Circulatory System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1349 31.1 Overview of the Circulatory System . . . . . . . . . . . . . . . . . . . . . . . . . . 1350 31.2 Components of the Blood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1354 31.3 Mammalian Heart and Blood Vessels . . . . . . . . . . . . . . . . . . . . . . . . . 1362 31.4 Blood Flow and Blood Pressure Regulation . . . . . . . . . . . . . . . . . . . . . . 1372 Chapter 32: Osmotic Regulation and Excretion . . . . . . . . . . . . . . . . . . . . . . . . 1393 32.1 Osmoregulation and Osmotic Balance . . . . . . . . . . . . . . . . . . . . . . . . . 1394 32.2 The Kidneys and Osmoregulatory Organs . . . . . . . . . . . . . . . . . . . . . . . 1398 32.3 Excretion Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140732.4 Nitrogenous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1410 32.5 Hormonal Control of Osmoregulatory Functions . . . . . . . . . . . . . . . . . . . . 1414 Chapter 33: The Immune System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1437 33.1 Innate Immune Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1438 33.2 Adaptive Immune Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1446 33.3 Antibodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1461 33.4 Disruptions in the Immune System . . . . . . . . . . . . . . . . . . . . . . . . . . 1467 Chapter 34: Animal Reproduction and Development . . . . . . . . . . . . . . . . . . . . . 1487 34.1 Reproduction Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1488 34.2 Fertilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1494 34.3 Human Reproductive Anatomy and Gametogenesis . . . . . . . . . . . . . . . . . 1496 34.4 Hormonal Control of Human Reproduction . . . . . . . . . . . . . . . . . . . . . . 1504 34.5 Fertilization and Early Embryonic Development . . . . . . . . . . . . . . . . . . . . 1510 34.6 Organogenesis and Vertebrate Formation . . . . . . . . . . . . . . . . . . . . . . . 1515 34.7 Human Pregnancy and Birth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1518 Unit 8 Chapter 35: Ecology and the Biosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1539 35.1 The Scope of Ecology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1540 35.2 Biogeography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1545 35.3 Terrestrial Biomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1552 35.4 Aquatic Biomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1560 35.5 Climate and the Effects of Global Climate Change . . . . . . . . . . . . . . . . . . 1568 Chapter 36: Population and Community Ecology . . . . . . . . . . . . . . . . . . . . . . . 1593 36.1 Population Demography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1594 36.2 Life Histories and Natural Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 1600 36.3 Environmental Limits to Population Growth . . . . . . . . . . . . . . . . . . . . . . 1605 36.4 Population Dynamics and Regulation . . . . . . . . . . . . . . . . . . . . . . . . . 1611 36.5 Human Population Growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1616 36.6 Community Ecology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1622 36.7 Behavioral Biology: Proximate and Ultimate Causes of Behavior . . . . . . . . . . . 1636 Chapter 37: Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1683 37.1 Ecology for Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1683 37.2 Energy Flow through Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . 1695 37.3 Biogeochemical Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1702 Chapter 38: Conservation Biology and Biodiversity . . . . . . . . . . . . . . . . . . . . . 1727 38.1 The Biodiversity Crisis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1728 38.2 The Importance of Biodiversity to Human Life . . . . . . . . . . . . . . . . . . . . . 1739 38.3 Threats to Biodiversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1743 38.4 Preserving Biodiversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1754 Appendix A: The Periodic Table of Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1773 Appendix B: Geological Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1775 Appendix C: Measurements and the Metric System . . . . . . . . . . . . . . . . . . . . . . . . 1777 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1779 This OpenStax book is available for free at http://cnx.org/content/col12078/1.6PREFACE Welcome to Biology for AP®Courses , an OpenStax resource
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However, like any professional-grade textbook, errors sometimes occur
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Subject matter experts review all errata suggestions
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OpenStax is committed to remaining transparent about all updates, so you will also find a list of past errata changes on your book page on OpenStax.org. Format You can access this textbook for free in web view or PDF through OpenStax.org, and for a low cost in print. About Biology for AP®Courses Biology for AP®Courses covers the scope and sequence requirements of a typical two-semester Advanced Placement® biology course
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The text provides comprehensive coverage of core biology concepts and foundational research through an evolutionary lens
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Biology for AP®Courses was designed to meet and exceed the requirements of the College Board’s AP® Biology framework while allowing significant flexibility for instructors
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Each section of the book includes an introduction based on the AP®curriculum as well as rich features that engage students in scientific practice and AP®test preparation
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It also highlights careers and research opportunities in the biological sciences. Coverage and scope In developing Biology for AP®Courses, we relied on experts in the goals and approach of the AP®curriculum, carefully considered the AP®framework design, and listened to the advice of hundreds of high school and college biology instructors. The result is a book that provides excellent coverage of the AP®framework while addressing the sheer breadth of biology topics in the modern age
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We provide a thorough treatment of biology’s foundational concepts while condensing selected topics
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We also strive to make biology, as a discipline, interesting and accessible to students
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In addition to a comprehensivePreface 1coverage of core concepts and foundational research, we have incorporated features that draw learners into the discipline in meaningful ways. Unit 1: The Chemistry of Life
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Our opening unit introduces students to the sciences, including scientific methods and the fundamental concepts of chemistry and physics that provide a framework within which learners comprehend biological processes. Unit 2: The Cell
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Students will gain solid understanding of the structures, functions, and processes of the most basic unit of life: the cell. Unit 3: Genetics
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Our comprehensive genetics unit takes learners from the earliest experiments that revealed the basis of inheritance through the intricacies of DNA’s structure, replication, and expression, to current applications in the studies of biotechnology and genomics. Unit 4: Evolutionary Processes
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The core concepts of evolution are discussed in this unit with examples illustrating evolutionary processes
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Additionally, the evolutionary basis of biology reappears throughout the textbook in general discussion and is also reinforced through special call-out features highlighting specific topics in evolution. Unit 5: Biological Diversity
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The diversity of life is explored through detailed study of all phyla of organisms as well as discussion of their phylogenetic relationships
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The unit begins with viruses and then moves through prokaryotes and eukaryotes, ending with a discussion of vertebrates and, finally, humans. Unit 6: Plant Structure and Function
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Our plant anatomy and physiology unit thoroughly covers the fundamental structure and function of plant cells, tissues, and organs
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It also covers important plant physiological functions such as tissue differentiation, material transport, and the roles of plant hormones. Unit 7: Animal Structure and Function
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An introduction to the form and function of the animal body is followed by detailed chapters on specific body systems and their physiological function
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This unit touches on the biology of all organisms while maintaining an engaging focus on human anatomy and physiology that helps students connect to the topics. Unit 8: Ecology
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Ecological concepts are broadly covered in this unit, beginning with the small-scale relationships of population ecology and gradually building to the large-scale processes of ecosystem ecology
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Localized, real-world issues of conservation and biodiversity are presented at numerous points along the way. AP®Connections Every section of the textbook — over 200 total — begins with a “Connection for AP®Courses.” Section
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Written by Julianne Zedalis, the College Board’s AP®Biology Curriculum Committee Co-Chair, these valuable overviews provide meaningful support for students and instructors. Each Connection highlights the key concepts of the section in the context of the AP®Biology Curriculum Framework and explains their importance in brief, engaging language. The explanations build upon the knowledge gained in previous sections, reinforcing the most significant concepts and alerting students of the foundational basis of upcoming material
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This helps students build a more comprehensive understanding and helps instructors reference prior explanations. Direct references to the relevant sections of the AP®Curriculum Framework are first explained and then outlined in table format emphasizing their importance and relating them to the overall design of the course
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Students and teachers using these reference tables can easily see their progression through and coverage of the required curriculum. Scientific practices The AP®Biology Science Practices are presented to students through several active learning features. Science Practice Connections for AP®Courses provide a context and suggested activity linking the concepts with the relevant science practices
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Students are often asked to build representations, undertake brief research, or answer critical thinking questions. Science Practice Questions , designed and authored by John Eggebrecht and Julianne Zedalis, present a complex scenario or data set and ask students a series of multiple-choice and open-ended questions based on a complex scenario or data set
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These robust activities hone students’ scientific thinking skills and prepare them for similar questions on the AP® Examination. Pedagogical foundation and features Biology for AP®Courses®is grounded in a solid scientific base, with features that engage the students in scientific inquiry:2 Preface This OpenStax book is available for free at http://cnx.org/content/col12078/1.6Evolution Connection features highlight the importance and relevance of evolutionary theory to all biological study
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Through discussions like “The Evolution of Metabolic Pathways” and “Algae and Evolutionary Paths to Photosynthesis,” the student is able to see how evolution pervades all aspects of biology. Scientific Methods Connection call-outs walk students through actual or thought experiments that elucidate scientific processes and procedures for a variety of topics
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Features include “Determining the Time Spent in Cell Cycle Stages” and “Testing the Hypothesis of Independent Assortment.” Career Connection features present information on a variety of careers in the biological sciences
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They are meant to introduce students to professions and day-to-day work related to the current section content
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Examples include microbiologist, ecologist, neurologist, and forensic scientist. Everyday Connection features tie biological concepts to students’ everyday lives as well as emerging world issues related to biology
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Topics include “Chesapeake Bay” and “Can Snail Venom Be Used as a Pharmacological Pain Killer?” Illustrations and animations that engage Illustrations within the book are designed to help students visualize the concepts of biology using figures with simple, clear, designs and color schemes that go side-by-side with vivid photos and micrographs
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Biology for AP®Courses also incorporates links to relevant animations and interactive exercises that help bring biology to life. Visual Connection features identify core figures in each chapter for student study
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Questions about key figures, including clicker questions that can be used in the classroom, engage students’ critical thinking to ensure genuine understanding. Link to Learning features direct students to online interactive exercises and animations that add greater context to core content. Additional resources Student and instructor resources We'’ve compiled additional resources for both students and instructors, including Getting Started Guides, and a teacher'’s guide
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Instructor resources require a verified instructor account, which you can apply for when you log in or create your account on OpenStax.org
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Take advantage of these resources to supplement your OpenStax book. Community Hubs Insert paragraph text here.OpenStax partners with the Institute for the Study of Knowledge Management in Education (ISKME) to offer Community Hubs on OER Commons – a platform for instructors to share community-created resources that support OpenStax books, free of charge
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Through our Community Hubs, instructors can upload their own materials or download resources to use in their own courses, including additional ancillaries, teaching material, multimedia, and relevant course content
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We encourage instructors to join the hubs for the subjects most relevant to your teaching and research as an opportunity both to enrich your courses and to engage with other faculty. ?To reach the Community Hubs, visit https://www.oercommons.org/hubs/OpenStax (https://www.oercommons.org/ hubs/OpenStax) . Partner resources OpenStax Partners are our allies in the mission to make high-quality learning materials affordable and accessible to students and instructors everywhere
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Their tools integrate seamlessly with our OpenStax titles at a low cost
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To access the partner resources for your text, visit your book page on OpenStax.org. About the authors Senior contributing authors Julianne Zedalis, Bishop’s School, La Jolla, California Julianne Zedalis has taught AP®Biology for over twenty years
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She served on the College Board’s committee to rewrite and test the revised AP® Curriculum Framework, working with other high school AP®teachers and college faculty as well as the National Science Foundation
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She was later selected to chair the College Board’s Curriculum Development andPreface 3Assessment Committee. John Eggebrecht Dr
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John Eggebrecht, Brooklyn Technical High School (retired), Brooklyn, New York John Eggebrecht taught AP®Physics and Biology courses for over thirty years
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He was instrumental in the development and revision of various AP®curriculum frameworks over an extended collaboration with the College Board and other educational organizations
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Under his guidance, Brooklyn Tech was repeatedly selected by the College Board as an exemplary AP®program, and its practices and students outcomes were featured in several publications
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In addition to his writing role, John regularly evaluates course materials and programs for alignment and quality. Contributing authors Connie Rye, East Mississippi Community College Robert Wise, The University of Wisconsin Oshkosh Vladimir Jurukovski, Suffolk County Community College Jean DeSaix, The University of North Carolina at Chapel Hill Jung Choi, Georgia Institute of Technology Yael Avissar, Rhode Island College Curriculum Framework for AP®Biology Big Idea 1: The process of evolution drives the diversity and unity of life. Enduring understanding 1.A
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Change in the genetic makeup of a population over time is evolution.Chapter/Key Concepts 1.A.1
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Natural selection is a major mechanism of evolution.5.3, 18.1, 18.2, 19.1, 19.2, 19.3, 21.2, 23.5 1.A.2
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Natural selection acts on phenotypic variations in populations. 7.3, 7.6, 18.2, 19.2, 19.3, 36.5 1.A.3
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Evolutionary change is also driven by random processes. 19.1, 19.2 1.A.4
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Biological evolution is supported by scientific evidence from many disciplines, including mathematics.2.1, 5.2, 8.2, 11.1, 14.1, 17.1 18.1, 19.3 Enduring understanding 1.B
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Organisms are linked by lines of descent from common ancestry.Chapter/Key Concepts 1.B.1
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Organisms share many conserved core processes and features that evolved and are widely distributed among organisms today.3.4, 4.3, 4.6, 8.2, 15.3, 13.2, 14.1, 15.5, 18.1, 20.1, 20.2 1.B.2
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Phylogenetic trees and cladograms are graphical representations (models) of evolutionary history that can be tested.14.4, 20.1, 20.2, 20.3 Enduring understanding 1.C
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Life continues to evolve within a changing environment.Chapter/Key Concepts 1.C.1
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Speciation and extinction have occurred throughout the Earth's history.14.4, 18.2, 20.1, 38.1 1.C.2
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Speciation may occur when two populations become reproductively isolated from each other.18.2, 19.2, 23.5 1.C.3
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Populations of organisms continue to evolve.7.3, 7.6, 18.1, 18.3, 19.1, 19.2, 20.1, 20.2, 23.5 Enduring understanding 1.D
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The origin of living systems is explained by natural processes.Chapter/Key Concepts 1.D.1
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There are several hypotheses about the natural origin of life on Earth, each with supporting scientific evidence.8.2, 18.1, 20.1, 21.1, 20.3 1.D.2
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Scientific evidence from many different disciplines supports models of the origin of life.8.2, 18.1, 20.2, 28.14 Preface This OpenStax book is available for free at http://cnx.org/content/col12078/1.6Big Idea 2: Biological systems utilize free energy and molecular building blocks to grow, to reproduce and to maintain dynamic homeostasis. Enduring understanding 2.A
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Growth, reproduction and maintenance of the organization of living systems require free energy and matter.Chapter/Key Concepts 2.A.1
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All living systems require constant input of free energy6.1, 6.2, 6.3, 6.4, 6.7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 8.2, 23.1, 23.5, 36.3, 37.2 2.A.2
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Organisms capture and store free energy for use in biological processes.3.2, 4.3, 6.1, 6.4, 6.5, 7.1, 7.2, 7.3, 7.4, 7.4, 7.5, 7.6, 8.1, 8.2, 8.3, 9.2, 22.1, 22.2, 23.1, 23.5, 37.2 2.A.3
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Organisms must exchange matter with the environment to grow, reproduce and maintain organization.2.1, 2.2, 3.3, 4.2, 4.6, 6.1, 6.8, 22.4, 22.5, 23.5, 25.8, 37.3 Enduring understanding 2.B
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Growth, reproduction and dynamic homeostasis require that cells create and maintain internal environments that are different from their external environments.Chapter/Key Concepts 2.B.1
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Cell membranes are selectively permeable due to their structure. 3.2, 3.3, 5.1, 5.2, 5.3, 5.4, 8.3 2.B.2
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Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.2.3, 3.3, 5.2, 5.3, 5.4 2.B.3
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Eukaryotic cells maintain internal membranes that partition the cell into specialized regions.3.3, 4.2, 4.3, 4.4 Enduring understanding 2.C
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Organisms use feedback mechanisms to regulate growth and reproduction, and to maintain dynamic homeostasis.Chapter/Key Concepts 2.C.1
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Organisms use feedback mechanisms to maintain their internal environments and respond to external environmental changes.5.2, 5.3, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 8.2, 10.1, 11.1, 21.1, 23.5, 24.3, 28.3 2.C.2
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