Two fundamental types of cells are known to exist in nature: prokaryotic cells and eukaryotic cells (like the one shown in the tour of an animal cell animation). both prokaryotic and eukaryotic cells carry out all of the processes necessary for life, but they differ in some important ways. in this activity, you will identify which cell structures are found only in prokaryotic cells, only in eukaryotic cells, or in both types of cells

Prokaryotes are identified with bacteria: most live as single-cell organisms but some bacteria associate in a chain. Prokaryotes have their DNA in the cytoplasm of the cell. Eukaryotes ("Eu" for true) have a nucleus, a compartment separated from the rest of the cellular content, which contains the DNA.
In both of eucaryotic an procaryotic cell, you can find DNA, all kinds of RNA, Cytoplasm, ribosomes, and a cell membrane,

In procaryotic cell only you can find: a cell wall (located outside the cell membrane), you may find also pili, capsids, plasmids, and flagella.

In a eucaryotic cell only, you can find Nucleus (which contain the DNA), mitochondria, endoplasmic reticulum, 

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons