At the beginning of the century, it was believed by physicists that atoms were made up of protons and electrons. This view of the atomic nucleus changed when James Chadwick discovered the ...

T he atomic nucleus is made up of protons and neutrons, particles that exist through the interaction of quarks bonded by gluons. It would seem, therefore, that it should not be difficult to ...

I've always been fascinated with bodies, with animals, with humans, how they work, what they're made up of. Meat is composed of animal cells, the cell membrane, the cytoplasm, and the nucleus.

The “lead” of a pencil is actually made of a substance called graphite which is made of carbon atoms. The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and ...

Chromosomes Threadlike structure found in the nucleus. Made of DNA which contains the genetic information of the cell. Cytoplasm Chemical reactions take place here. Mitochondria Site of cell ...