Plant cells have several structures not found in other eukaryotes. In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls ...

The right amount of oxygen being present when the Earth’s core was formed meant that there was sufficient phosphorus and nitrogen available in the mantle and crust. This means the Earth was the ...

Vibrio cholerae is a facultative pathogen that has an environmental reservoir in aquatic ecosystems and a pathogenic phase in the human small intestine. It produces cholera toxin in the small ...