They are signal molecules produced within the plant functioning in extremely low concentrations. The acid growth theory states that the auxin-induced acidification of plant cell walls causes their ...

Scientists studying samples that NASA collected from the asteroid Bennu found a wide assortment of organic molecules that shed light on how life arose. By Carl Zimmer Our solar system contains ...

These include amino acids, which are the molecules that make up proteins, as well as nucleobases - the fundamental components of DNA. This doesn't mean there was ever life on Bennu, but it ...