Nitrogen is fixed in the soil from the atmosphere, in a process called nitrification, by nitrogen-fixing bacteria or on a rare occasion, by lightning strikes. The nitrogen is fixed as, ammonia, nitrites, and nitrates. These nitrogen-based compounds are then taken up by plants and used to make nitrogen-based bio-molecules such as amino acids and nucleic acids. When plants are consumed by primary consumers, these compounds are transferred up in the food chain.
By increasing the enzyme concentration, the maximum reaction rate greatly increases. Conclusions: The rate of a chemical reaction increases as the substrate concentration increases. Enzymes can greatly speed up the rate of a reaction.
genetic analyses promise to bring to the surface understudied social systems, such as sibling relationships, that have an impact on human development independent of genotype.