The electrons in an atom tend to occupy distinct shells. What about particles in the nucleus? The "magic numbers" of the isotope chart suggest that they also have a shell arrangement ...

In most animal, plant and fungal cells DNA is stored in the nucleus coiled up in thread-like structures called chromosomes. The nucleus of one of your skin cells contains about two metres of DNA ...

Eukaryotic cells form the foundation of complex, multicellular life, including apple trees, mushrooms, fish and humans. Their defining feature is the presence of membrane-bound organelles, ...

Each component of a cell has its own function ... Plant cells have a rigid cell structure. They are made up of a cell wall, cell membrane, cytoplasm, vacuole, nucleus, and chloroplasts.

Within every cell (except red blood cells) is a nucleus -- a sphere-like structure separated from ... don't code for proteins and have no known function. Within the rest of the genome are an ...

However, they still require proteins made from instructions in the cell nucleus to function properly and to assemble multiprotein complexes like ... Altering this amino acid and the chemical ...

Most cells in the human body each contain about six feet of DNA. Yet the nucleus, where DNA is coiled, is no larger than a ...