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Biology - Crash Course video playlist - Short videos teaching Biology. Based on AP Biology.
1.1 The Science of Life
1.2 The Nature of Science
1.3 An Example of Scientific Inquiry: Darwin and Evolution
1.4 Core Concepts in Biology
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 Free to access or download.
The Need for Critical Thinking and the Scientific Method by 
Human Biology by 
Microbiology by 2.1 The Nature of Atoms
2.2 Elements Found in Living Systems
2.3 The Nature of Chemical Bonds
2.4 Water: A Vital Compound
2.5 Properties of Water
2.6 Acids and Bases
View a short video on ionic and covalent bonding.
Concepts of Biology is a textbook by OpenStax licensed under CC BY 4.0 (See Ch 2. Chemistry of Life). Free to access.
Principles of Chemistry by 3.1 Carbon: The Framework of Biological Molecules
3.2 Carbohydrates: Energy Storage and Structural Molecules
3.3 Nucleic Acids: Information Molecules
3.4 Proteins: Molecules with Diverse Structures and Functions
3.5 Lipids: Hydrophobic Molecules
Learn more about the chemical building blocks of life at Biological macromolecules review - by Khan Academy.
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 3 Biological Macromolecules). Free to access.
Biology: Molecules and Cells by John Campton
Biochemistry 2 by 4.1 Cell Theory
4.2 Prokaryotic Cells
4.3 Eukaryotic Cells
4.4 The Endomembrane System
4.5 Mitochondria and Chloroplasts: Cellular Generators
4.6 The Cytoskeleton
4.7 Extracellular Structures and Cell Movement
4.8 Cell-to-Cell Interactions
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 4. Cell Structure). Free to access.
Video - Cell Structure and Function
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5.1 The Structure of Membranes
5.2 Phospholipids: The Membrane's Foundation
5.3 Proteins: Multifunctional Components
5.4 Passive Transport Across Membranes
5.5 Active Transport Across Membranes
5.6 Bulk Transport by Endocytosis and Exocytosis
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 5. Structure and Function of Plasma Membranes). Free to access.
6.1 The Flow of Energy in Living Systems
6.2 The Laws of Thermodynamics and Free Energy
6.3 ATP: The Energy Currency of Cells
6.4 Enzymes: Biological Catalysts
6.5 Metabolism: The Chemical Description of Cell Function
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 6. Metabolism). Free to access.
Microbiology by Enzymes: Organic Catalysts
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7.1 Overview of Respiration
7.2 Glycolysis: Splitting Glucose
7.3 The Oxidation of Pyruvate Produces Acetyl-CoA
7.4 The Citric Acid Cycle
7.5 The Electron Transport Chain and Chemiosmosis
7.6 Energy Yields of Aerobic Respiration
7.7 Regulation of Aerobic Respiration
7.8 Oxidation Without 02
7.9 Catabolism of Proteins and Fats
7.10 Evolution of Metabolism
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 7. Cellular Respiration). Free to access.
Cell Metabolism and Respiration
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8.1 Overview of Photosynthesis
8.2 The Discovery of Photosynthetic Processes
8.3 Pigments
8.4 Photosystem Organization
8.5 The Light-Dependent Reactions
8.6 Carbon Fixation: The Calvin Cycle
8.7 Photorespiration
Learn more about photosynthesis at Khan Academy link .
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See 8.1 Overview of Photosynthesis). Free to access.
Photosynthesis - The Botany Series
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Photosynthesis: Solar Energy for the Biosphere and Mankind by 
Aquatic Photosynthesis by 
Photosynthesis by 10.1 Bacterial Cell Division
10.2 Eukaryotic Chromosomes
10.3 Overview of the Eukaryotic Cell Cycle
10.4 Interphase: Preparation for Mitosis
10.5 M Phase: Chromosome Segregation and the Division of Cytoplasmic Contents
10.6 Control of the Cell Cycle
10.7 Genetics of Cancer
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 10 Cell Reproduction). Free to access.
Cell Division and Growth
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11.1 Sexual Reproduction Requires Meiosis
11.2 Features of Meiosis
11.3 The Process of Meiosis
11.4 Summing Up: Meiosis Versus Mitosis
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 11 Meiosis and Sexual Reproduction). Free to access.
Meiosis
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12.1 The Mystery of Heredity
12.2 Monohybrid Crosses: The Principle of Segregation
12.3 Dihybrid Crosses: The Principle of Independent Assortment
12.4 Probability: Predicting the Results of Crosses
12.5 The Testcross: Revealing Unknown Genotypes
12.6 Extensions to Mendel
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 12 Mendel's Experiments and Heredity). Free to access.
Mendel's Law of Inheritance
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13.1 Sex Linkage and the Chromosomal Theory of Inheritance
13.2 Sex Chromosomes and Sex Determination
13.3 Exceptions to the Chromosomal Theory of Inheritance
13.4 Genetic Mapping
13.5 Human Genetic Disorders
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 13 Modern Understandings of Inheritance). Free to access.
Cell Biology and Genetics by Mitosis and Meiosis: Heredity
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The Human Genome by 14.1 The Nature of Genetic Material
14.2 DNA Structure
14.3 Basic Characteristics of DNA Replication
14.4 Prokaryotic Replication
14.5 Eukaryotic Replication
14.6 DNA Repair
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 14 DNA Structure and Function). Free to access.
DNA and Inheritance: Heredity
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Understand Your DNA by 15.1 The Nature of Genes
15.2 The Genetic Code
15.3 Prokaryotic Transcription
15.4 Eukaryotic Transcription
15.5 Eukaryotic pre-mRNA Splicing
15.6 The Structure of tRNA and Ribosomes
15.7 The Process of Translation
15.8 Summarizing Gene Expression
15.9 Mutation: Altered Genes
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 15 Genes and Proteins). Free to access.
16.1 Control of Gene Expression
16.2 Regulatory Proteins
16.3 Prokaryotic Regulation
16.4 Eukaryotic Regulation
16.5 Chromatin Structure Affects Gene Expression
16.6 Eukaryotic Postranscriptional Regulation
16.7 Protein Degradation
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See Ch 11 Meiosis and Sexual Reproduction). Free to access.
Gene Expression by 17.1 Recombinant DNA
17.2 Amplifying DNA Using the Polymerase Chain Reaction
17.3 Creating, Correcting, and Analyzing Genetic Variation
17.4 Constructing and Using Transgenic Organisms
17.5 Environmental Applications
17.6 Medical Applications
17.7 Agricultural Applications
Biotechnology by 
Biotechnology by 
Biotechnology by The Biggest Revolution in Gene Editing: Crispr-Cas9 Explained
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Biotechnology on the Farm and in the Factory: Agricultural and Industrial Applications
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Biotechnology and Your Health: Pharmaceutical Applications
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20.1 Genetic Variation
20.2 Changes in Allele Frequency
20.3 Five Agents of Evolutionary Change
20.4 Quantifying Natural Selection
20.5 Reproductive Strategies
20.6 Natural Selection's Role in Maintaining Variation
20.7 Selection Acting on Traits Affected by Multiple Genes
20.8 Experimental Studies of Natural Selection
20.9 Interactions Among Evolutionary Forces
20.10 The Limits of Selection
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See 18.1 Understanding Evolution). Free to access.
The Secret Life of Genes by 21.1 The Beaks of Darwin's Finches: Evidence of Natural Selection
21.2 Peppered Moths and Industrial Melanism: More Evidence of Selection
21.3 Artificial Selection: Human-Initiated Change
21.4 Fossil Evidence of Evolution
21.5 Anatomical Evidence for Evolution
21.6 Convergent Evolution and the Biogeographical Record
21.7 Darwin's Critics
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See 18.1 Understanding Evolution). Free to access.
Evolution: What the Fossils Say and Why It Matters by 22.1 The Nature of Species and the Biological Species Concept
22.2 Natural Selection and Reproductive Isolation
22.3 The Role of Genetic Drift and Natural Selection in Speciation
22.4 The Geography of Speciation
22.5 Adaptive Radiation and Biological Diversity
22.6 The Pace of Evolution
22.7 Speciation and Extinction Through Time
Biology 2e is a textbook by OpenStax is licensed under CC BY 4.0 (See 19.2 Population Genetics). Free to access.
The Evolutionary Biology of Species by 
Relentless Evolution by 
The Theory of Evolution by 
Biological Extinctions by 
