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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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    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.
    898

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    182

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    Maintaining Cellular Conditions: pH and Buffers
    This module introduces the chemical reactions related to pH in the context of understanding how acidity can affect both the structure and chemical reactivity of cellular molecules. It is intended...
    857

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    Mitotic Index and Cell Division
    This module introduces the mitotic index in the context of understanding the dynamics of cell division in the root of a plant. It is intended for an introductory biology audience.
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    Muscle Contraction
    This module introduces equations around muscle force in the context of understanding the Sliding Filament Model. It is intended for an introductory biology audience.
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    Optimal Foraging Theory
    This module introduces the optimal foraging strategy in the context of understanding competition and coexistence among species. It is intended for an introductory biology audience.
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    Phototropism and Gravitropism: Quantifying Stem Curvature in Plants Introduction
    This module introduces phototropism and gravitropism in the context of understanding how to quantify stem curvature of plants. It is intended for an introductory biology audience.
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    Population Genetics: Limits to Adaptation
    This module introduces gene flow in the context of understanding the persistence of maladaptive traits in some populations. It is intended for an introductory biology audience.
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    Quantitative Cytological Characteristics: Photorespiration
    This module introduces quantitative cytological characteristics in the context of understanding cell behavior under stress. It is intended for an introductory biology audience.
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    167

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    Spider Silk: Stress-Strain Curves and Young's Modulus
    This module introduces the stress-strain curve in the context of understanding materials' mechanical behavior. It is intended for an introductory biology audience.
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    The Chi-Square Test
    This module introduces how to determine whether observation is significantly different from expectation in the context of understanding Chi-square Test. It is intended for an introductory biology...
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    Translocation of Nutrients in the Phloem: Dixon's Paradox
    This module introduces the Dixon equation in the context of understanding nutrient transport through sieve tubes. It is intended for an introductory biology audience.
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    179

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    Translocation of Nutrients in the Phloem: Poiseuille's Equation
    This module introduces the Poiseuille equation in the context of understanding nutrient flow in plant cells. It is intended for an introductory biology audience.
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    198

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    Type I Functional Response
    This module introduces the type I functional response in the context of understanding the relationship between an individual's rate of consumption and food density. It is intended for an...
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    160

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    Type II Functional Response: Holling’s Disk Equation
    This module introduces the Holling’s disk equation in the context of understanding the relationship between an individual's rate of consumption and food density. It is intended for an introductory...
    867

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    157

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    Water Movement through a Membrane: The Van't Hoff Equation
    This module introduces the van't Hoff equation in the context of understanding the metabolic activity of the epithelial cells lining the stomach. It is intended for an introductory biology audience.
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    174

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    Cohort Life Tables
    This module introduces cohort life tables in the context of understanding demographic processes and how they affect populations. It is intended for an introductory biology audience.
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    Regulation of Sex Determination
    This activity accompanies the HHMI BioInteractive module Sex Verification of Athletes (​https://www.hhmi.org/biointeractive/testing-athletes​). It provides students with exercises to explore the...
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    Cell Division and Rates of Population Growth
    This module introduces the exponential growth of cells in the context of understanding cell division. It is intended for an introductory biology audience.
    1077

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    194

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    Energy Absorbed from Light During Photosynthesis
    This module introduces how energy absorption from light is affected by the wavelengths in the context of understanding photosynthesis. It is intended for an introductory biology audience.
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