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Biology - Khan Academy FREE

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updated 10/26/2015

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

Lessons
1) Introduction to Evolution and Natural Selection Introduction to evolution, variation in a population and natural selection More free lessons at: http://www.khanacademy.org/video?v=GcjgW 827 views watch video
2) Ape Clarification Ape Clarification - that they have no tails More free lessons at: http://www.khanacademy.org/video?v=oFGkY 850 views watch video
3) Intelligent Design and Evolution The argument that evolution speaks to being the most "intelligent design" More free lessons at: http://www.khanacademy.org/video?v=qxOEz 817 views watch video
4) Evolution Clarification Clarifying some points on evolution and intelligent design More free lessons at: http://www.khanacademy.org/video?v=nh1R- 835 views watch video
5) Natural Selection and the Owl Butterfly How the "Owl Butterfly" may have gotten the spot on its wings. More free lessons at: http://www.khanacademy.org/video?v=dR_BF 967 views watch video
6) DNA An introduction to DNA More free lessons at: http://www.khanacademy.org/video?v=_-vZ_ 799 views watch video
7) Variation in a Species How variation can be introduced into a species. More free lessons at: http://www.khanacademy.org/video?v=DuArV 758 views watch video
8) Chromosomes, Chromatids, Chromatin, etc. The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication More free lessons at: http://www.khanacademy.org/video?v=s9HPN 772 views watch video
9) Mitosis, Meiosis and Sexual Reproduction Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers. 718 views watch video
10) Phases of Mitosis Explanation of the phases of mitosis. More free lessons at: http://www.khanacademy.org/video?v=LLKX_ 718 views watch video
11) Phases of Meiosis The phases of Meiosis. More free lessons at: http://www.khanacademy.org/video?v=ijLc5 785 views watch video
12) Embryonic Stem Cells An overview of early development of a zygote to an embryo. Embryonic and somatic stem cells. More free lessons at: http://www.khanacademy.org/video?v=-yCIM 876 views watch video
13) Cancer An introduction to what cancer is and how it is the by-product of broken DNA replication More free lessons at: http://www.khanacademy.org/video?v=RZhL7 716 views watch video
14) Introduction to Heredity Heredity and Classical Genetics. Dominant and recessive traits. Heterozygous and homozygous genotypes. More free lessons at: http://www.khanacademy.org/video?v=eEUvR 1,030 views watch video
15) Punnett Square Fun Dihybrid crosses. Independent assortment. Incomplete dominance. Codominance and multiple alleles. More free lessons at: http://www.khanacademy.org/video?v=D5ymM 820 views watch video
16) Hardy-Weinberg Principle Understanding allele and genotype frequency in population in Hardy-Weinberg Equilibrium. 760 views watch video
17) Sex-Linked Traits Chromosomal basis for gender. Sex-linked traits. More free lessons at: http://www.khanacademy.org/video?v=-ROhf 776 views watch video
18) Bacteria Introduction to bacteria More free lessons at: http://www.khanacademy.org/video?v=TDoGr 709 views watch video
19) Viruses Introduction to viruses More free lessons at: http://www.khanacademy.org/video?v=0h5Jd 693 views watch video
20) ATP: Adenosine Triphosphate Introduction to ATP or Adenosine Triphosphate 748 views watch video
21) Introduction to Cellular Respiration Introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain 731 views watch video
22) Oxidation and Reduction Review From Biological Point-of-View Taking a looking at oxidation and reduction in a biological context More free lessons at: http://www.khanacademy.org/video?v=orI2m 822 views watch video
23) Oxidation and Reduction in Cellular Respiration Oxidation and reduction in cellular respiration. Reconciling the biology and chemistry definitions of oxidation and reduction. More free lessons at: http://www.khanacademy.org/video?v=_KyyV 671 views watch video
24) Glycolysis Overview of glycolysis More free lessons at: http://www.khanacademy.org/video?v=FE2jf 685 views watch video
25) Krebs / Citric Acid Cycle Overview of the Krebs or Citric Acid Cycle More free lessons at: http://www.khanacademy.org/video?v=juM2R 893 views watch video
26) Electron Transport Chain Overview of the Electron Transport Chain More free lessons at: http://www.khanacademy.org/video?v=mfgCc 738 views watch video
27) Oxidative Phosphorylation and Chemiosmosis Oxidative Phosphorylation and Chemiosmosis (along with slight correction of previous video) More free lessons at: http://www.khanacademy.org/video?v=W_Q17 957 views watch video
28) Photosynthesis Overview of photosythesis More free lessons at: http://www.khanacademy.org/video?v=-rsYk 742 views watch video
29) Photosynthesis: Light Reactions 1 Details on the light-dependent reactions of photosynthesis More free lessons at: http://www.khanacademy.org/video?v=GR2GA 882 views watch video
30) Photosynthesis: Light Reactions and Photophosphorylation More detail on the light reactions and photophorylation More free lessons at: http://www.khanacademy.org/video?v=yfR36 720 views watch video
31) Photosynthesis: Calvin Cycle The Calvin Cycle or the light-independent (dark) reactions of photosythesis More free lessons at: http://www.khanacademy.org/video?v=slm6D 714 views watch video
32) Photorespiration More detail on the Calvin Cycle and Photorespiration More free lessons at: http://www.khanacademy.org/video?v=EQvTE 772 views watch video
33) C-4 Photosynthesis C-4 Photosynthesis: How some plants avoid photorespiration More free lessons at: http://www.khanacademy.org/video?v=7ynX_ 778 views watch video
34) CAM Plants How CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the day More free lessons at: http://www.khanacademy.org/video?v=xp6Zj 752 views watch video
35) Parts of a cell Parts of a cell: nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, chloroplasts, vacuoles, and vesicles 714 views watch video
36) Diffusion and Osmosis Diffusion and Osmosis More free lessons at: http://www.khanacademy.org/video?v=aubZU 721 views watch video
37) The Lungs and Pulmonary System The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm More free lessons at: http://www.khanacademy.org/video?v=SPGRk 710 views watch video
38) Red blood cells Oxygen uptake by hemoglobin in red blood cells More free lessons at: http://www.khanacademy.org/video?v=fLKOB 777 views watch video
39) Circulatory System and the Heart Introduction to the circulatory system and the heart More free lessons at: http://www.khanacademy.org/video?v=QhiVn 736 views watch video
40) Hemoglobin Hemoglobin and its role in the circulatory system More free lessons at: http://www.khanacademy.org/video?v=LWtXt 706 views watch video
41) Anatomy of a Neuron Introduction to the neuron and its anatomy More free lessons at: http://www.khanacademy.org/video?v=ob5U8 950 views watch video
42) Sodium Potassium Pump How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane More free lessons at: http://www.khanacademy.org/video?v=C_H-O 804 views watch video
43) Correction to Sodium and Potassium Pump Video Correction to Sodium and Potassium Pump Video More free lessons at: http://www.khanacademy.org/video?v=ye3rT 719 views watch video
44) Electrotonic and Action Potentials How electrotonic and action potentials propagate down cells 688 views watch video
45) Neuronal Synapses (Chemical) How one neuron can stimulate (or inhibit) another neuron at a chemical synapse More free lessons at: http://www.khanacademy.org/video?v=Tbq-K 726 views watch video
46) Myosin and Actin How myosin and actin interact to produce mechanical force. More free lessons at: http://www.khanacademy.org/video?v=zopoN 793 views watch video
47) Tropomyosin and troponin and their role in regulating muscle contraction Tropomyosin and troponin and their role in regulating muscle contraction. How calcium ion concentration dictates whether a muscle is contracting or not. More free lessons at: http://www.khanacademy. ... 806 views watch video
48) Role of the Sarcoplasmic Reticulum in Muscle Cells The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell More free lessons at: http://www.khanacademy.org/video?v=SauhB 659 views watch video
49) Anatomy of a muscle cell Understanding the structure of a muscle cell More free lessons at: http://www.khanacademy.org/video?v=uY2ZO 699 views watch video
50) Role of Phagocytes in Innate or Nonspecific Immunity Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. More free lessons at: http://www.khanacademy.org/video?v=O1N2r 854 views watch video
51) Types of immune responses: Innate and Adaptive. Humoral vs. Cell-Mediated Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity. More free lessons at: http ... 714 views watch video
52) B Lymphocytes (B cells) Overview of B cells (B lymphocytes) and how they are activated and produce antibodies More free lessons at: http://www.khanacademy.org/video?v=Z36dU 703 views watch video
53) Professional Antigen Presenting Cells (APC) and MHC II complexes How professional antigen presenting cells present parts of engulfed pathogens on MHC II complexes (major histocompatibility complexes). More free lessons at: http://www.khanacademy.org/video?v=j_kSm ... 751 views watch video
54) Helper T Cells Introduction to helper T cells and their role in activating B cells More free lessons at: http://www.khanacademy.org/video?v=uwMYp 636 views watch video
55) Cytotoxic T Cells How cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells More free lessons at: http://www.khanacademy.org/video?v=oqI4s 634 views watch video
56) Review of B cells, CD4+ T cells and CD8+ T cells Review of B cells, CD4+ T cells and CD8+ T cells More free lessons at: http://www.khanacademy.org/video?v=xaz5f 681 views watch video
57) Inflammatory Response Overview of the inflammatory response More free lessons at: http://www.khanacademy.org/video?v=FXSuE 676 views watch video
58) The Kidney and Nephron Overview of how the nephrons in the kidney filter blood and reabsorb water and other molecules. More free lessons at: http://www.khanacademy.org/video?v=cc8sU 599 views watch video
59) Secondary Active Transport in the Nephron Secondary Active Transport in the Nephron More free lessons at: http://www.khanacademy.org/video?v=czY5n 745 views watch video
60) Species What a species is and isn't. Ligers, tiglons, mule, hinnies, and dogs More free lessons at: http://www.khanacademy.org/video?v=Tmt4z 824 views watch video
61) Taxonomy and the Tree of Life The science of taxonomy and where humans fit into the tree of life More free lessons at: http://www.khanacademy.org/video?v=oHvLl 976 views watch video

Biology - Khan Academy FREE

Lessons

Introduction to evolution, variation in a population and natural selection More free lessons at: http://www.khanacademy.org/video?v=GcjgW

Ape Clarification - that they have no tails More free lessons at: http://www.khanacademy.org/video?v=oFGkY

The argument that evolution speaks to being the most "intelligent design" More free lessons at: http://www.khanacademy.org/video?v=qxOEz

Clarifying some points on evolution and intelligent design More free lessons at: http://www.khanacademy.org/video?v=nh1R-

How the "Owl Butterfly" may have gotten the spot on its wings. More free lessons at: http://www.khanacademy.org/video?v=dR_BF

An introduction to DNA More free lessons at: http://www.khanacademy.org/video?v=_-vZ_

How variation can be introduced into a species. More free lessons at: http://www.khanacademy.org/video?v=DuArV

The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication More free lessons at: http://www.khanacademy.org/video?v=s9HPN

Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.

Explanation of the phases of mitosis. More free lessons at: http://www.khanacademy.org/video?v=LLKX_

The phases of Meiosis. More free lessons at: http://www.khanacademy.org/video?v=ijLc5

An overview of early development of a zygote to an embryo. Embryonic and somatic stem cells. More free lessons at: http://www.khanacademy.org/video?v=-yCIM

An introduction to what cancer is and how it is the by-product of broken DNA replication More free lessons at: http://www.khanacademy.org/video?v=RZhL7

Heredity and Classical Genetics. Dominant and recessive traits. Heterozygous and homozygous genotypes. More free lessons at: http://www.khanacademy.org/video?v=eEUvR

Dihybrid crosses. Independent assortment. Incomplete dominance. Codominance and multiple alleles. More free lessons at: http://www.khanacademy.org/video?v=D5ymM

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

Chromosomal basis for gender. Sex-linked traits. More free lessons at: http://www.khanacademy.org/video?v=-ROhf

Introduction to bacteria More free lessons at: http://www.khanacademy.org/video?v=TDoGr

Introduction to viruses More free lessons at: http://www.khanacademy.org/video?v=0h5Jd

Introduction to ATP or Adenosine Triphosphate

Introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain

Taking a looking at oxidation and reduction in a biological context More free lessons at: http://www.khanacademy.org/video?v=orI2m

Oxidation and reduction in cellular respiration. Reconciling the biology and chemistry definitions of oxidation and reduction. More free lessons at: http://www.khanacademy.org/video?v=_KyyV

Overview of glycolysis More free lessons at: http://www.khanacademy.org/video?v=FE2jf

Overview of the Krebs or Citric Acid Cycle More free lessons at: http://www.khanacademy.org/video?v=juM2R

Overview of the Electron Transport Chain More free lessons at: http://www.khanacademy.org/video?v=mfgCc

Oxidative Phosphorylation and Chemiosmosis (along with slight correction of previous video) More free lessons at: http://www.khanacademy.org/video?v=W_Q17

Overview of photosythesis More free lessons at: http://www.khanacademy.org/video?v=-rsYk

Details on the light-dependent reactions of photosynthesis More free lessons at: http://www.khanacademy.org/video?v=GR2GA

More detail on the light reactions and photophorylation More free lessons at: http://www.khanacademy.org/video?v=yfR36

The Calvin Cycle or the light-independent (dark) reactions of photosythesis More free lessons at: http://www.khanacademy.org/video?v=slm6D

More detail on the Calvin Cycle and Photorespiration More free lessons at: http://www.khanacademy.org/video?v=EQvTE

C-4 Photosynthesis: How some plants avoid photorespiration More free lessons at: http://www.khanacademy.org/video?v=7ynX_

How CAM Plants are able to fix carbon at night so they don't have to keep their stomata open during the day More free lessons at: http://www.khanacademy.org/video?v=xp6Zj

Parts of a cell: nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, chloroplasts, vacuoles, and vesicles

Diffusion and Osmosis More free lessons at: http://www.khanacademy.org/video?v=aubZU

The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm More free lessons at: http://www.khanacademy.org/video?v=SPGRk

Oxygen uptake by hemoglobin in red blood cells More free lessons at: http://www.khanacademy.org/video?v=fLKOB

Introduction to the circulatory system and the heart More free lessons at: http://www.khanacademy.org/video?v=QhiVn

Hemoglobin and its role in the circulatory system More free lessons at: http://www.khanacademy.org/video?v=LWtXt

Introduction to the neuron and its anatomy More free lessons at: http://www.khanacademy.org/video?v=ob5U8

How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane More free lessons at: http://www.khanacademy.org/video?v=C_H-O

Correction to Sodium and Potassium Pump Video More free lessons at: http://www.khanacademy.org/video?v=ye3rT

How electrotonic and action potentials propagate down cells

How one neuron can stimulate (or inhibit) another neuron at a chemical synapse More free lessons at: http://www.khanacademy.org/video?v=Tbq-K

How myosin and actin interact to produce mechanical force. More free lessons at: http://www.khanacademy.org/video?v=zopoN

Tropomyosin and troponin and their role in regulating muscle contraction. How calcium ion concentration dictates whether a muscle is contracting or not. More free lessons at: http://www.khanacademy. ...

The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell More free lessons at: http://www.khanacademy.org/video?v=SauhB

Understanding the structure of a muscle cell More free lessons at: http://www.khanacademy.org/video?v=uY2ZO

Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. More free lessons at: http://www.khanacademy.org/video?v=O1N2r

Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity. More free lessons at: http ...

Overview of B cells (B lymphocytes) and how they are activated and produce antibodies More free lessons at: http://www.khanacademy.org/video?v=Z36dU

How professional antigen presenting cells present parts of engulfed pathogens on MHC II complexes (major histocompatibility complexes). More free lessons at: http://www.khanacademy.org/video?v=j_kSm ...

Introduction to helper T cells and their role in activating B cells More free lessons at: http://www.khanacademy.org/video?v=uwMYp

How cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells More free lessons at: http://www.khanacademy.org/video?v=oqI4s

Review of B cells, CD4+ T cells and CD8+ T cells More free lessons at: http://www.khanacademy.org/video?v=xaz5f

Overview of the inflammatory response More free lessons at: http://www.khanacademy.org/video?v=FXSuE

Overview of how the nephrons in the kidney filter blood and reabsorb water and other molecules. More free lessons at: http://www.khanacademy.org/video?v=cc8sU

Secondary Active Transport in the Nephron More free lessons at: http://www.khanacademy.org/video?v=czY5n

What a species is and isn't. Ligers, tiglons, mule, hinnies, and dogs More free lessons at: http://www.khanacademy.org/video?v=Tmt4z

The science of taxonomy and where humans fit into the tree of life More free lessons at: http://www.khanacademy.org/video?v=oHvLl

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