There are 20 amino acids that make up proteins and all have the same basic structure ... An amino acid’s structure consists of a central carbon atom attached to a hydrogen, an acidic carboxyl group ...

In fact, each gene in cellular DNA contains the code for a unique protein structure. Not only are these ... that consist of an alpha (central) carbon atom linked to an amino group, a carboxyl ...

Unit 1 Some Basic Concepts of Chemistry Importance ... Stoichiometry and Stochiometric Calculations. Unit 2 Structure of the Atom Discovery of Subatomic Particles, Atomic Models, Developments ...

Atomic structure - AQA Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The number of subatomic particles in an atom can be calculated from the atom's ...

Laura is an Assistant Editor for The Scientist. She has a background in microbiology. Her science communication work spans journalism and public engagement. View Full Profile. Learn about our ...

Beyond the ladder-like structure described above, another key characteristic of double-stranded DNA is its unique three-dimensional shape. The first photographic evidence of this shape was ...