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    Sex Verification Testing of Athletes
    This interactive module explores the biology of sex determination and development in humans, set against the backdrop of the different sex testing policies implemented throughout sports history.
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    The Biology of Skin Color
    This film explores the hypothesis that different tones of skin color in humans arose as adaptations to the intensity of ultraviolet radiation in different parts of the world.
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    Electrical Activity of Neurons
    This tutorial describes how neurons generate action potentials, and how scientists measure neuronal activity and record the firing of individual neurons.
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    Summary of the National Academies Report on Data Science for Undergraduates
    Under the auspices of the National Academies, a Committee developed a consensus report regarding means to enhance undergraduate programs in the emerging discipline of data science.
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    Antibody Binding
    This module introduces the Scatchard equation in the context of understanding antigen binding and the properties of antigens. It is intended for an introductory biology audience.
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    Body Size Constraints in Xylem Feeding Insects: Allometric Relationships
    This module introduces body size constraints of xylem-feeding insects in the context of understanding allometric relationships. It is intended for an introductory biology audience.
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    Cardiac Output
    This module introduces Fick's principle in the context of understanding the cardiac output. It is intended for an introductory biology audience.
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    Cell Aggregation and Sphere Packing
    This module introduces the calculation of packing density in the context of understanding cell aggregation and arrangement. It is intended for an introductory biology audience.
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    Cell Division and the Presence of a Growth Factor
    This module introduces exponential growth, the Michaelis-Menten, and Lineweaver-Burk equations in the context of understanding how growth factors influence cell division. It is intended for an...
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    Chemoreception
    This module introduces the probability of cell and molecule collisions in the context of understanding chemoreception. It is intended for an introductory biology audience.
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    152

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    Coordinating Photosynthetic Activity: Circadian Rhythms
    This module introduces circadian rhythms in the context of understanding the ability of organisms to measure time. It is intended for an introductory biology audience.
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    176

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    Diffusion Through a Cell Membrane
    This module introduces rates of diffusion in the context of understanding simple and facilitated diffusion through the cell membrane. It is intended for an introductory biology audience.
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    205

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    Diversity Indices: Shannon's H and E
    This module introduces Shannon's diversity index in the context of understanding how to mathematically measure the species diversity in a community. It is intended for an introductory biology...
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    299

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    Diversity Indices: Simpson's D and E
    This module introduces Simpson's diversity index in the context of understanding how to mathematically measure the species diversity in a community. It is intended for an introductory biology...
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    DNA and Knot Theory
    This module introduces knot theory in the context of understanding the packing of DNA. It is intended for an introductory biology audience.
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    167

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    Enzymes and the Rate of Chemical Reactions
    This module introduces rates of reactions in the context of understanding how enzymes affect chemical reactions. It is intended for an introductory biology audience.
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    Estimating Tree Heights: Right Triangle Trigonometry
    This module introduces basic trigonometry calculations in the context of understanding tree height calculations. It is intended for an introductory biology audience.
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    Half Life of mRNA
    This module introduces exponential growth and decay in the context of understanding the stability of mRNA. It is intended for an introductory biology audience.
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    Hardy-Weinberg Equilibrium
    This module introduces the Hardy-Weinberg model in the context of understanding the population's genotype and allele frequencies. It is intended for an introductory biology audience.
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    324

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    Hemoglobin Evolution
    This module introduces equations describing blood viscosity and oxygen transport in the context of understanding the evolution of red blood cells. It is intended for an introductory biology audience.
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    171

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