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College Biology: Help and Review

Course Summary

Increase your understanding of those challenging college biology subjects with this biology review course. Short video lessons and quizzes work like a flexible, comprehensive study guide that can supplement your college textbooks and class lectures to help you prepare for a test and get a good grade.
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Try it risk-free for 30 days

25 chapters in College Biology: Help and Review

Course Practice Test

Check your knowledge of this course with a 50-question practice test.
  • Comprehensive test covering all topics
  • Detailed video explanations for wrong answers
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Course Progress Best Score
Lesson 1 - How a Phospholipid Bilayer Is Both Hydrophobic and Hydrophilic  Take Quiz
Lesson 2 - The Fluid Mosaic Model of the Cell Membrane  Take Quiz
Lesson 3 - Passive Transport in Cells: Simple and Facilitated Diffusion & Osmosis  Take Quiz
Lesson 4 - Active Transport in Cells: Definition & Examples  Take Quiz
Lesson 5 - Endocytosis and Exocytosis Across the Cell Membrane  Take Quiz
Lesson 6 - Structure of the Nucleus: Nucleolus, Nuclear Membrane, and Nuclear Pores  Take Quiz
Lesson 7 - The Ribosome: Structure, Function and Location  Take Quiz
Lesson 8 - The Endomembrane System: Functions & Components  Take Quiz
Lesson 9 - The Cytoskeleton: Microtubules and Microfilaments  Take Quiz
Lesson 10 - Mitochondria Structure: Cristae, Matrix and Inner & Outer Membrane  Take Quiz
Lesson 11 - Chloroplast Structure: Chlorophyll, Stroma, Thylakoid, and Grana  Take Quiz
Lesson 12 - Plant Cell Structures: The Cell Wall and Central Vacuole  Take Quiz
Lesson 13 - Eukaryotic and Prokaryotic Cells: Similarities and Differences  Take Quiz
Lesson 14 - Viruses: Bacteriophage Lytic and Lysogenic Cycles  Take Quiz
Lesson 15 - Spindle Fibers: Definition, Location & Purpose  Take Quiz
Lesson 16 - Aquaporins: Definition & Function  Take Quiz
Lesson 17 - Diploid Cell: Definition & Examples  Take Quiz
Lesson 18 - Haploid: Definition, Life Cycle & Example  Take Quiz
Lesson 19 - Homologous: Definition, Characteristics & Structure Examples  Take Quiz
Lesson 20 - Impermeable Membrane: Definition & Explanation  Take Quiz
Lesson 21 - Microtubules: Definition, Functions & Structure  Take Quiz
Lesson 22 - Monosaccharides: Definition, Structure & Examples  Take Quiz
Lesson 23 - Peroxisomes: Definition, Structure & Functions  Take Quiz
Lesson 24 - Simple Cuboidal Epithelium: Location, Structure & Function  Take Quiz
Lesson 25 - Intracellular & Extracellular Digestion  Take Quiz
Lesson 26 - Cell Nucleus: Definition & Examples  Take Quiz
Lesson 27 - Cells With a Nucleus & Membrane-Bound Organelles  Take Quiz
Lesson 28 - Cell-Free Protein Synthesis: Steps & Applications  Take Quiz
Lesson 29 - Cells With & Without a Nucleus: Structure & Classification  Take Quiz
Lesson 30 - Cellular Structure: Function & Definition  Take Quiz
Lesson 31 - Do Blood Cells Have a Nucleus?  Take Quiz
Lesson 32 - Pancreatic Acinar Cells: Definition & Function  Take Quiz
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Course Progress Best Score
Lesson 1 - Classification of Vascular, Nonvascular, Monocot & Dicot Plants  Take Quiz
Lesson 2 - Structure of Plant Stems: Vascular and Ground Tissue  Take Quiz
Lesson 3 - Apical Meristem & Primary Shoot System Growth  Take Quiz
Lesson 4 - Lateral Meristem & Secondary Shoot System Growth  Take Quiz
Lesson 5 - Structure of Leaves: The Epidermis, Palisade and Spongy Layers  Take Quiz
Lesson 6 - Primary Root Tissue, Root Hairs and the Plant Vascular Cylinder  Take Quiz
Lesson 7 - Root System Growth: The Root Cap, Primary Roots & Lateral Roots  Take Quiz
Lesson 8 - Nitrogen Fixation: Significance to Plants and Humans  Take Quiz
Lesson 9 - Xylem: The Effect of Transpiration and Cohesion on Function  Take Quiz
Lesson 10 - Phloem: The Pressure Flow Hypothesis of Food Movement  Take Quiz
Lesson 11 - Flowers: Structure and Function of Male & Female Components  Take Quiz
Lesson 12 - Methods of Pollination and Flower-Pollinator Relationships  Take Quiz
Lesson 13 - Medicinal Plants: Uses & Definition  Take Quiz
Lesson 14 - Algae: Products, Applications & Industrial Uses  Take Quiz
Lesson 15 - Leaf Abscission: Definition & Purpose  Take Quiz
Lesson 16 - Phyllotaxis: Spiral & Fibonacci  Take Quiz
Lesson 17 - Companion Cells in Plants: Function & Concept  Take Quiz
Lesson 18 - Cytokinins in Plants: Function & Concept  Take Quiz
Lesson 19 - Endodermis in Plants: Function & Definition  Take Quiz
Lesson 20 - Gynoecium: Definition & Concept  Take Quiz
Lesson 21 - Lateral Meristem: Definition & Concept  Take Quiz
Lesson 22 - Lignin: Definition, Properties & Function  Take Quiz
Lesson 23 - Palisade Layer of a Leaf: Function & Definition  Take Quiz
Lesson 24 - Plant Photoreceptors: Definition, Types & Function  Take Quiz
Lesson 25 - Vascular Bundles in Plants: Function & Types  Take Quiz
Lesson 26 - What is Plant Physiology? - Definition & Experiments  Take Quiz
Lesson 27 - Adventitious Roots: Definition & Examples  Take Quiz
Lesson 28 - Aerial Roots: Definition, Function & Examples  Take Quiz
Lesson 29 - Aggregate Fruit: Definition & Examples  Take Quiz
Lesson 30 - Cambium Tissue: Definition, Features & Examples  Take Quiz
Lesson 31 - Perfect Flowers: Definition, Diagram & Examples  Take Quiz
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Course Progress Best Score
Lesson 1 - Multicellular Organisms, Tissues and Epithelium  Take Quiz
Lesson 2 - Types of Connective Tissue  Take Quiz
Lesson 3 - Skeletal System and Muscular System  Take Quiz
Lesson 4 - Circulatory System I: Types of Circulatory Systems  Take Quiz
Lesson 5 - Circulatory System II: The Human Vascular System  Take Quiz
Lesson 6 - Circulatory System III: The Heart  Take Quiz
Lesson 7 - Circulatory System IV: Red Blood Cells  Take Quiz
Lesson 8 - Circulatory System V: Hemoglobin  Take Quiz
Lesson 9 - Gas Exchange in the Human Respiratory System  Take Quiz
Lesson 10 - Digestive System I: The Upper Gastrointestinal Tract  Take Quiz
Lesson 11 - Digestive System II: The Lower Gastrointestinal Tract  Take Quiz
Lesson 12 - Excretory System  Take Quiz
Lesson 13 - What Is an Organ System? - Definition & Pictures  Take Quiz
Lesson 14 - Axons: Definition & Function  Take Quiz
Lesson 15 - Constriction: Definition & Meaning  Take Quiz
Lesson 16 - Maxillary Artery: Anatomy & Branches &  Take Quiz
Lesson 17 - Mouth Cancer: Causes, Symptoms & Treatment  Take Quiz
Lesson 18 - Respiratory Pigments: Animals & Explanation  Take Quiz
Lesson 19 - What Are Fibroblasts? - Definition & Explanation  Take Quiz
Lesson 20 - What are Veins? - Functions & Explanation  Take Quiz
Lesson 21 - What is Angiogenesis? - Definition & Factors  Take Quiz
Lesson 22 - What is Epidermis? - Definition, Function & Layers  Take Quiz
Lesson 23 - What Is Mucus? - Definition, Causes & Purpose  Take Quiz
Lesson 24 - What is Physiology? - Definition & History  Take Quiz
Lesson 25 - Osseous Tissue: Connective & Bone  Take Quiz
Lesson 26 - What is Cardiac Ablation? - Definition, Procedure & Risks  Take Quiz
Lesson 27 - Cardiac Ablation: Recovery & Therapy  Take Quiz
Lesson 28 - Radiofrequency Ablation: Procedure & Side Effects  Take Quiz
Lesson 29 - Acinetobacter Baumannii Infection: Causes & Symptoms  Take Quiz
Lesson 30 - Preventing & Treating Acinetobacter Baumannii Infection  Take Quiz
Lesson 31 - Actinomyces Israelii: Symptoms & Treatment  Take Quiz
Lesson 32 - Compare & Contrast Open & Closed Circulatory Systems  Take Quiz
Lesson 33 - Complete Digestive Tract: Definition & Advantages  Take Quiz
Lesson 34 - Bone Health: Definition, Nutrition & Tips  Take Quiz
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Course Progress Best Score
Lesson 1 - Homeostasis and Temperature Regulation in Humans  Take Quiz
Lesson 2 - Homeostasis of Glucose Levels: Hormonal Control and Diabetes  Take Quiz
Lesson 3 - Functions of the Nervous System  Take Quiz
Lesson 4 - The Structure and Function of Neurons  Take Quiz
Lesson 5 - The Central and Peripheral Nervous Systems  Take Quiz
Lesson 6 - The Sympathetic and Parasympathetic Nervous Systems  Take Quiz
Lesson 7 - Brain Structures and Functions Part I  Take Quiz
Lesson 8 - The Cerebral Cortex: Brain Structures and Functions Part II  Take Quiz
Lesson 9 - Innate Immunity: Inflammation, Neutrophils & Natural Killer Cells  Take Quiz
Lesson 10 - Acquired Immunity: T Cells, B Cells and Antibodies  Take Quiz
Lesson 11 - Antibiotics and Vaccines  Take Quiz
Lesson 12 - Flu Viruses, HIV and Immune System Evasion  Take Quiz
Lesson 13 - Pathogens: Antibiotic Resistance and Virulence  Take Quiz
Lesson 14 - Afferent Division of the Peripheral Nervous System  Take Quiz
Lesson 15 - Lens of the Eye: Definition & Function  Take Quiz
Lesson 16 - Neurobiology: Definition & Concept  Take Quiz
Lesson 17 - Parietal Lobe: Definition & Functions  Take Quiz
Lesson 18 - Retrovirus: Definition, Life Cycle & Example  Take Quiz
Lesson 19 - Temporal Lobe: Definition & Functions  Take Quiz
Lesson 20 - What is a Neural Tube? - Definition, Development & Disorders  Take Quiz
Lesson 21 - What is Virulence?  Take Quiz
Lesson 22 - Cholinergic Urticaria: Definition, Symptoms & Treatment  Take Quiz
Lesson 23 - Maintaining Homeostasis: Importance & Examples  Take Quiz
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Course Progress Best Score
Lesson 1 - Overview of Animal Reproduction and Development  Take Quiz
Lesson 2 - Spermatogenesis: How the Male Reproductive System Produces Sperm  Take Quiz
Lesson 3 - Oogenesis: How the Female Reproductive System Produces Eggs  Take Quiz
Lesson 4 - Early Embryonic Development: The Morula and Blastula  Take Quiz
Lesson 5 - Embryo Implantation and Placenta Formation  Take Quiz
Lesson 6 - The Placenta and the Fetus: Structure and Function  Take Quiz
Lesson 7 - Amniotic Fluid, The Amnion, and the Yolk Sac  Take Quiz
Lesson 8 - Gastrulation and the 3 Germ Layers (Ectoderm, Endoderm & Mesoderm)  Take Quiz
Lesson 9 - Spemann's Organizer: Controller of Cell Fate  Take Quiz
Lesson 10 - Concentration Gradients, Signaling Molecules & Inhibitors in Development  Take Quiz
Lesson 11 - How Signaling Molecules Control Differentiation  Take Quiz
Lesson 12 - How Fate Mapping Is Used to Track Cell Development  Take Quiz
Lesson 13 - Allotransplantation, Allografts & Xenografts  Take Quiz
Lesson 14 - Animal Asexual Reproduction  Take Quiz
Lesson 15 - Ectoderm Layer: Definition & Derivatives  Take Quiz
Lesson 16 - Sexual Reproduction: Definition & Overview  Take Quiz
Lesson 17 - What is Species Diversity? - Definition, Importance & Examples  Take Quiz
Lesson 18 - Thyroid Problems During & After Pregnancy  Take Quiz
Lesson 19 - Do Animals Use Tools?  Take Quiz
Lesson 20 - Characteristics of Chordata Reproduction  Take Quiz
Lesson 21 - Extraembryonic Membranes in Humans  Take Quiz
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Course Progress Best Score
Lesson 1 - Genetics: Heredity, Traits & Chromosomes  Take Quiz
Lesson 2 - Properties of Alleles  Take Quiz
Lesson 3 - Mendel's First Law: The Law of Segregation  Take Quiz
Lesson 4 - Application of Mendel's First Law  Take Quiz
Lesson 5 - Mendel's Second Law: The Law of Independent Assortment  Take Quiz
Lesson 6 - Mendel's Dihybrid Cross Example: Practice & Ratio  Take Quiz
Lesson 7 - Exceptions to Simple Dominance: Codominance and Incomplete Dominance  Take Quiz
Lesson 8 - Exceptions to Independent Assortment: Sex-Linked and Sex-Limited Traits  Take Quiz
Lesson 9 - Crossing Over & Gene Linkage: Definition, Importance & Results  Take Quiz
Lesson 10 - Human Genetics: Multifactorial Traits & Model Organisms  Take Quiz
Lesson 11 - Additive Alleles: Definition & Characteristics  Take Quiz
Lesson 12 - How Does the Adiabatic Process Work? - Definition & Examples  Take Quiz
Lesson 13 - What are Genotypes? - Definition & Examples  Take Quiz
Lesson 14 - Genotypic Frequency: Definition & Explanation  Take Quiz
Lesson 15 - Monophyletic Groups: Definition & Examples  Take Quiz
Lesson 16 - Multiple Alleles: Definition & Example  Take Quiz
Lesson 17 - Random Assortment of Chromosomes: Definition & Explanation  Take Quiz
Lesson 18 - Simple Dominance: Definition & Concept  Take Quiz
Lesson 19 - What is Gene Therapy? - Definition, History Pros, Cons & Examples  Take Quiz
Lesson 20 - What Is Assortative Mating?  Take Quiz
Lesson 21 - Y Chromosome: Definition, Disorders & Structure  Take Quiz
Lesson 22 - Genetic Engineering & Insulin Production  Take Quiz
Lesson 23 - Genetic Linkage: Definition & Analysis  Take Quiz
Lesson 24 - Genetic Linkage: Problems, Mapping & Studies  Take Quiz
Lesson 25 - Gregor Mendel: Biography, Facts & Timeline  Take Quiz
Lesson 26 - Heritability Coefficient  Take Quiz
Lesson 27 - Heritability of Intelligence  Take Quiz
Lesson 28 - Heritable Characteristics & Diseases  Take Quiz
Lesson 29 - Holandric Genes: Traits & Inheritance  Take Quiz
Lesson 30 - Mendelian & Non-Mendelian Traits in Humans: Definition & List  Take Quiz
Lesson 31 - The Differences Between Primary & Secondary Succession  Take Quiz
Lesson 32 - Recessive Epistasis: Definition, Examples & Causes  Take Quiz
Lesson 33 - Specific vs. Non-Specific Immunity  Take Quiz
Lesson 34 - Difference Between Genes & Alleles  Take Quiz
Lesson 35 - Heterochromia: Definition & Causes  Take Quiz
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Course Progress Best Score
Lesson 1 - The Environment, Levels of Ecology and Ecosystems  Take Quiz
Lesson 2 - Ecosystems, Habitats and Ecological Niches  Take Quiz
Lesson 3 - Food Chains, Trophic Levels and Energy Flow in an Ecosystem  Take Quiz
Lesson 4 - Interspecific Competition, Competitive Exclusion & Niche Differentiation  Take Quiz
Lesson 5 - Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration  Take Quiz
Lesson 6 - Symbiotic Relationships: Mutualism, Commensalism & Parasitism  Take Quiz
Lesson 7 - Populations: Density, Survivorship and Life Histories  Take Quiz
Lesson 8 - Carrying Capacity, Migration & Dispersion  Take Quiz
Lesson 9 - Dispersal, Colonization, and Island Biogeography  Take Quiz
Lesson 10 - Conservation Biology, Habitat Fragmentation, and Metapopulations  Take Quiz
Lesson 11 - Ecological Succession: From Pioneer to Climax Communities  Take Quiz
Lesson 12 - How Introduced and Invasive Species Alter Ecological Balance  Take Quiz
Lesson 13 - Biomes: Desert, Tropical Rainforest, Savanna, Coral Reefs & More  Take Quiz
Lesson 14 - Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines  Take Quiz
Lesson 15 - Biogeochemical Cycling and the Phosphorus Cycle  Take Quiz
Lesson 16 - The Nitrogen Cycle, Acid Rain and Fossil Fuels  Take Quiz
Lesson 17 - The Carbon Cycle and Long-Term Carbon Storage  Take Quiz
Lesson 18 - Fossil Fuels, Greenhouse Gases, and Global Warming  Take Quiz
Lesson 19 - Symbiotic Relationship: Definition & Examples  Take Quiz
Lesson 20 - Army Ants: Facts, Types & Life Cycle  Take Quiz
Lesson 21 - Estuary: Definition, Facts, Characteristics & Examples  Take Quiz
Lesson 22 - What is the Biogeochemical Cycle? - Definition & Explanation  Take Quiz
Lesson 23 - Manganese: Facts, Uses & Benefits  Take Quiz
Lesson 24 - Acid Rain: Effects & Causes  Take Quiz
Lesson 25 - Batesian Mimicry: Examples & Definition  Take Quiz
Lesson 26 - Chaparral Biome: Definition & Locations  Take Quiz
Lesson 27 - Climax Community: Definition & Example  Take Quiz
Lesson 28 - Clumped Dispersion Pattern: Definition & Explanation  Take Quiz
Lesson 29 - Denitrification: Definition & Explanation  Take Quiz
Lesson 30 - Intraspecific Competition: Example & Definition  Take Quiz
Lesson 31 - Island Biogeography: Theory, Definition & Graph  Take Quiz
Lesson 32 - Metapopulation: Definition, Theory & Examples  Take Quiz
Lesson 33 - Trophic Levels in a Food Chain: Definition & Explanation  Take Quiz
Lesson 34 - What Are Coral Reefs? - Facts & Types  Take Quiz
Lesson 35 - What Is Ecology? - Definition & Explanation  Take Quiz
Lesson 36 - What is Prey? - Definition & Examples  Take Quiz
Lesson 37 - Wildlife Corridors: Definition & Explanation  Take Quiz
Lesson 38 - Arctic Food Chain  Take Quiz
Lesson 39 - Food Chain of a Cheetah  Take Quiz
Lesson 40 - The Food Chain of a Deciduous Forest  Take Quiz
Lesson 41 - The Desert Energy Pyramid  Take Quiz
Lesson 42 - The Food Chain of a Dolphin  Take Quiz
Lesson 43 - Freshwater Food Chain  Take Quiz
Lesson 44 - Grassland Food Chain  Take Quiz
Lesson 45 - Human Food Chain: Definition & Examples  Take Quiz
Lesson 46 - Industrial Food Chain  Take Quiz
Lesson 47 - The Food Chain of a Lion  Take Quiz
Lesson 48 - Ocean Energy Pyramid  Take Quiz
Lesson 49 - Ocean Food Chain  Take Quiz
Lesson 50 - Owl Food Chain  Take Quiz
Lesson 51 - Polar Bear Food Chain  Take Quiz
Lesson 52 - The Pond Food Chain  Take Quiz
Lesson 53 - Prairie Food Chains & Webs  Take Quiz
Lesson 54 - Quaternary Consumers: Definition & Types  Take Quiz
Lesson 55 - Rainforest Food Chains  Take Quiz
Lesson 56 - Respiration in the Water Cycle  Take Quiz
Lesson 57 - The Food Chain of a Tiger  Take Quiz
Lesson 58 - Wetland Food Chains  Take Quiz
Lesson 59 - Wolf Food Chain  Take Quiz
Lesson 60 - Chordata Germ Layers  Take Quiz
Lesson 61 - Abiotic Synthesis & the Origin of Life  Take Quiz
Lesson 62 - Pink River Dolphins: Facts & Habitat  Take Quiz
Lesson 63 - What is a Species? - Definition & Explanation  Take Quiz
Lesson 64 - Omnivores: Definition & Examples  Take Quiz
Lesson 65 - Detritivores: Definition & Examples  Take Quiz
Lesson 66 - Ocean Producers and Consumers  Take Quiz
Lesson 67 - Abiotic Factors in Freshwater vs. Ocean Biomes  Take Quiz
Lesson 68 - What is an Exoskeleton? - Definition, Advantages & Examples  Take Quiz
Lesson 69 - Chordata Respiratory System  Take Quiz