Course: Biology

Course: Biology


by: Salman Khan , Khan Academy subject: Biology & Bio Technology


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Course description

Covers topics seen in a first year college or high school biology course.

Lectures

Lecture: Introduction to Evolution, Variation in a Population and Natural Selection

Lecture #1: Introduction to Evolution, Variation in a Population and Natural S...

Introduction to evolution, variation in a population and natural selection....

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Lecture: Arguments for Intelligent Design and Evolution

Lecture #2: Arguments for Intelligent Design and Evolution...

The argument that evolution speaks to being the most "intelligent design"....

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Lecture: Clarifying Points on Evolution

Lecture #3: Clarifying Points on Evolution...

Clarifying some points on evolution and intelligent design....

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Lecture: The Owl Butterfly: Natural Selection

Lecture #4: The Owl Butterfly: Natural Selection...

How the "Owl Butterfly" may have gotten the spot on its wings....

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Lecture: DNA: Introduction

Lecture #5: DNA: Introduction...

An introduction to DNA....

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Lecture: How Variation in a Species Can Be Introduced

Lecture #6: How Variation in a Species Can Be Introduced...

How variation can be introduced into a species....

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Lecture: DNA: Chromosomes, Chromatides, Chromatin, etc.

Lecture #7: DNA: Chromosomes, Chromatides, Chromatin, etc....

The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, transl...

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Lecture: Understanding Mitosis, Meiosis, and Sexual Reproduction

Lecture #8: Understanding Mitosis, Meiosis, and Sexual Reproduction...

Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and ha...

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Lecture: Mitosis

Lecture #9: Mitosis...

Explanation of the phases of mitosis....

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Lecture: Meiosis

Lecture #10: Meiosis...

The phases of Meiosis....

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Lecture: Embryonic Stem Cells: Early Development

Lecture #11: Embryonic Stem Cells: Early Development...

An overview of early development of a zygote to an embryo. Embryonic and somatic...

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Lecture: Cancer: Broken DNA Replication

Lecture #12: Cancer: Broken DNA Replication...

An introduction to what cancer is and how it is the by-product of broken DNA rep...

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Lecture: Heredity: Genetics and Traits

Lecture #13: Heredity: Genetics and Traits...

Heredity and Classical Genetics. Dominant and recessive traits. Heterozygous and...

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Lecture: Punnet Square Fun Overview

Lecture #14: Punnet Square Fun Overview...

Dihybrid crosses. Independent assortment. Incomplete dominance. Codominance and ...

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Lecture: Hardy-Weinberg Equilibrium

Lecture #15: Hardy-Weinberg Equilibrium...

Understanding allele and genotype frequency in population in Hardy-Weinberg Equi...

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Lecture: Gender: Sex Linked Traits

Lecture #16: Gender: Sex Linked Traits...

Chromosomal basis for gender. Sex-linked traits....

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Lecture: Bacteria Introduction

Lecture #17: Bacteria Introduction...

Introduction to bacteria....

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Lecture: Viruses Introduction

Lecture #18: Viruses Introduction...

Introduction to viruses....

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Lecture: Adenosine Triphosphate: ATP Introduction

Lecture #19: Adenosine Triphosphate: ATP Introduction...

Introduction to ATP or Adenosine Triphosphate....

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Lecture: Cellular Respiration

Lecture #20: Cellular Respiration...

Introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the elec...

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Lecture: Oxidation and Reduction Overview

Lecture #21: Oxidation and Reduction Overview...

Taking a looking at oxidation and reduction in a biological context....

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Lecture: Introduction to Oxidation and Reduction in Cellular Respiration

Lecture #22: Introduction to Oxidation and Reduction in Cellular Respiration...

Oxidation and reduction in cellular respiration. Reconciling the biology and che...

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Lecture: Glycolysis Introduction

Lecture #23: Glycolysis Introduction...

Overview of glycolysis....

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Lecture: Krebs and the Citric Acid Cycle

Lecture #24: Krebs and the Citric Acid Cycle...

Overview of the Krebs or Citric Acid Cycle....

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Lecture: Electron Transport Chain

Lecture #25: Electron Transport Chain...

Overview of the Electron Transport Chain....

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Lecture: Oxidative Phosphorylation and Chemiosmosis

Lecture #26: Oxidative Phosphorylation and Chemiosmosis ...

Oxidative Phosphorylation and Chemiosmosis (along with slight correction of prev...

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Lecture: Photosynthesis

Lecture #27: Photosynthesis...

Overview of photosythesis....

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Lecture: Photosynthesis: Details of Light Reactions

Lecture #28: Photosynthesis: Details of Light Reactions ...

Details on the light-dependent reactions of photosynthesis....

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Lecture: Calvin Cycle or the Light-independent Reactions of Photosythesis

Lecture #29: Calvin Cycle or the Light-independent Reactions of Photosythesis ...

More detail on the light reactions and photophorylation....

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Lecture: Calvin Cycle and Photorespiration Part 2

Lecture #30: Calvin Cycle and Photorespiration Part 2...

The Calvin Cycle or the light-independent (dark) reactions of photosythesis....

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Lecture: C-4 Photosynthesis: How Some Plants Avoid Photorespiration

Lecture #31: C-4 Photosynthesis: How Some Plants Avoid Photorespiration ...

C-4 Photosynthesis: How some plants avoid photorespiration....

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Lecture: CAM Plants

Lecture #32: CAM Plants...

How CAM Plants are able to fix carbon at night so they don't have to keep their ...

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Lecture: Cell Parts

Lecture #33: Cell Parts...

Parts of a cell: nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitoch...

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Lecture: Diffusion and Osmosis

Lecture #34: Diffusion and Osmosis...

Diffusion and Osmosis....

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Lecture: The Lungs and Pulmonary System

Lecture #35: The Lungs and Pulmonary System...

The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles,...

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Lecture: Red Blood Cells: Oxygen Uptake by Hemoglobin

Lecture #36: Red Blood Cells: Oxygen Uptake by Hemoglobin...

Oxygen uptake by hemoglobin in red blood cells....

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Lecture: Circulatory System and the Heart

Lecture #37: Circulatory System and the Heart...

Introduction to the circulatory system and the heart....

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Lecture: Hemoglobin

Lecture #38: Hemoglobin...

Hemoglobin and its role in the circulatory system....

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Lecture: Neuron: Anatomy

Lecture #39: Neuron: Anatomy...

Introduction to the neuron and its anatomy....

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Lecture: Sodium Potassium Pump

Lecture #40: Sodium Potassium Pump...

How a sodium potassium pump can maintain a voltage gradient across a cell or neu...

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Lecture: Electronic and Action Potentials

Lecture #41: Electronic and Action Potentials...

Correction to Sodium and Potassium Pump Video....

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Lecture: Saltatory Conduction in a Neuron

Lecture #42: Saltatory Conduction in a Neuron...

How electrotonic and action potentials propagate down cells....

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Lecture: Neuronal Synapsis (Chemical)

Lecture #43: Neuronal Synapsis (Chemical)...

How one neuron can stimulate (or inhibit) another neuron at a chemical synapse....

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Lecture: Myosin and Actin

Lecture #44: Myosin and Actin...

How myosin and actin interact to produce mechanical force....

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Lecture: Tropomyosin and Troponin

Lecture #45: Tropomyosin and Troponin...

Tropomyosin and troponin and their role in regulating muscle contraction. How ca...

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Lecture: Role of the Sarcoplasmic

Lecture #46: Role of the Sarcoplasmic...

The role of the sarcoplasmic reticulum in controlling calcium ion concentrations...

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Lecture: Muscle Cell Structure

Lecture #47: Muscle Cell Structure...

Understanding the structure of a muscle cell....

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Lecture: Role of Phagocytes in Innate or Nonspecific Immunity

Lecture #48: Role of Phagocytes in Innate or Nonspecific Immunity...

Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, ...

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Lecture: Innate and Adaptive Humoral vs. Cell-Mediated Immune Responses

Lecture #49: Innate and Adaptive Humoral vs. Cell-Mediated Immune Responses...

Overview of types of immune responses. Difference between innate and adaptive im...

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Lecture: B Cells: B Lymphocytes

Lecture #50: B Cells: B Lymphocytes...

Overview of B cells (B lymphocytes) and how they are activated and produce antib...

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Lecture: Professional Antigen Presenting Cells (APC) and MHC II Complexes

Lecture #51: Professional Antigen Presenting Cells (APC) and MHC II Complexes ...

How professional antigen presenting cells present parts of engulfed pathogens on...

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Lecture: Helper T Cells: Activating B Cells

Lecture #52: Helper T Cells: Activating B Cells...

Introduction to helper T cells and their role in activating B cells....

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Lecture: Cytotoxic T Cells: Activation by MHC-Vantigen Complexes

Lecture #53: Cytotoxic T Cells: Activation by MHC-Vantigen Complexes...

How cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed ...

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Lecture: Review of B Cells, CD4+ T Cells and CD8+ T Cells

Lecture #54: Review of B Cells, CD4+ T Cells and CD8+ T Cells ...

Review of B cells, CD4+ T cells and CD8+ T cells....

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Lecture: Inflammatory Response

Lecture #55: Inflammatory Response ...

Overview of the inflammatory response....

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Lecture: Kidney Function

Lecture #56: Kidney Function...

Overview of how the nephrons in the kidney filter blood and reabsorb water and o...

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Lecture: Secondary Active Transport in the Nephron

Lecture #57: Secondary Active Transport in the Nephron ...

Secondary Active Transport in the Nephron....

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Editors Pick

15 Steps to Cultivate Lifelong Learning

"The real voyage of discovery consists not in seeking new lands, but in seeing with new eyes."
Marcel Proust"

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