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Citric Acid Cycle

This animation shows the reactions of the citric acid cycle, which splits off carbon atoms and generates energy-rich reduced forms of cofactor molecules. It is the first of three animations about cellular respiration.

Biochemistry & Molecular Biology
Cell Biology
Animations
High School — AP/IB
College
Electron Transport Chain

This animation shows how the enzyme complexes of the electron transport chain harvest energy from cofactor molecules to pump protons across the mitochondrial membrane and establish a chemical gradient. It is the second of three animations about cellular respiration.

Biochemistry & Molecular Biology
Cell Biology
Animations
High School — AP/IB
College
ATP Synthesis

This animation shows how the proton gradient across the mitochondrial membrane powers the ATP synthase enzyme to make ATP. It is the third of three animations about cellular respiration.

Biochemistry & Molecular Biology
Cell Biology
Animations
High School — AP/IB
College
Age Structure of Ebola Outbreaks

This activity guides the analysis of a published scientific figure from a study that investigated demographic patterns in Ebola outbreaks from the Democratic Republic of the Congo.

Microbiology
Science Practices
Data Points
High School — General
High School — AP/IB
College
Patterns of Zoonotic Disease

This activity guides the analysis of a published scientific figure from a study on the global distribution of zoonotic pathogens and their host species.

Microbiology
Science Practices
Data Points
High School — General
High School — AP/IB
College
Root Movement

This activity explores images of plant cells and structures, which serve as phenomena for learning about how plants respond to stimuli.

Cell Biology
Anatomy & Physiology
Phenomenal Images
High School — General
High School — AP/IB
Slug Power

This activity explores images of a sea slug and chloroplasts, which serve as phenomena for learning about photosynthesis.

Anatomy & Physiology
Evolution
Phenomenal Images
High School — General
High School — AP/IB
Mystery of the Missing Tusks

This activity explores images of elephants with and without tusks, which serve as phenomena for learning about selection and human impacts on the frequency of traits within populations.

Evolution
Environmental Science
Phenomenal Images
High School — General
High School — AP/IB
Population Regulation in the Serengeti

In this activity, students learn about the factors that regulate the population sizes of wildebeest and buffalo in Serengeti National Park.

Ecology
Science Practices
Case Studies
High School — General
High School — AP/IB
College
Evaluating Science in the News

In this activity, students evaluate a science news article to determine whether it is a trustworthy source of information.

Science Practices
Lessons
High School — General
High School — AP/IB
College