Try this quiz based on GCSE Biology ... molecules. Nutrients are passed to other organisms in a food web. Enzymes are biological catalysts. How are levels maintained within an ecosystem? - OCR ...

Enzymes are also involved in the building up of chemical molecules elsewhere in the body. In an organism, the active site of each enzyme is a different shape. It is a perfect match to the shape of ...

Biological sciences majors study the elements of life, from molecules ... may require higher-level classes. Students with a B.S. may go on to pursue advanced studies in biology or work in research ...

Before the time of Wöhler and Berthelot, the understanding of even simple molecules was as naïve as our current understanding of complex biological ... biology at a far more quantitative level.