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This animation shows how the proton gradient across the mitochondrial membrane powers the ATP synthase enzyme to make ATP. It is the fifth of six animations about cellular respiration. These animations bring to life the molecular engines inside mitochondria that generate ATP, the main source of chemically stored energy used throughout the body.

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 fourth of six animations about cellular respiration. These animations bring to life the molecular engines inside mitochondria that generate ATP, the main source of chemically stored energy used throughout the body.

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 third of six animations about cellular respiration. These animations bring to life the molecular engines inside mitochondria that generate ATP, the main source of chemically stored energy used throughout the body.

The COVID-19 pandemic has spotlighted the importance of having a scientifically literate public. In this article, Pennsylvania educator Bob Cooper unpacks how to utilize BioInteractive's suite of infectious disease resources to teach students scientific literacy.

We are in the process of updating “Curriculum Connections” of our resources to align with the 2019 AP Biology course content and are sharing an AP Bio 2015 → 2019 Crosswalk that educators can use to align our resources with the 2019 standards.

This four-part animation series explores the biology of the virus SARS-CoV-2, which has caused a global pandemic of the disease COVID-19.

Every year, as many as 400 million people are infected with life-threatening diseases by the Aedes aegypti mosquito. It wasn’t always so dangerous.

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.

Trees now cover most of the exclusion zone, and climate change is making them more likely to burn.

Although scientists often worry most about the loss of the world’s predators, a comprehensive new study finds that plant-eating herbivores are the animals most at risk of extinction.

The added information provided at pause points within the animation Coral Bleaching allows for a richer exploration of coral reefs, symbiosis, and other topics in biology.

For the first time, scientists have shown that hummingbirds can sing and hear in pitches beyond the known range of other birds, according to research published Friday in the journal Science Advances.