THERE has been considerable discussion during the past thirty years or so about the shape and in particular about the planarity of the fluorene molecule. If the molecule is not flat, then there is ...

DNA is a complex molecule that consists of two strands coiled around each other to form a double helix structure. Comparison of a single ... Each codon specifies a particular amino acid or a stop ...

The structure of a small molecule can also be shown as a three-dimensional ball and stick model. These models show how the atoms and bonds are arranged in space. The diagram shows a ball and stick ...