the mere presence of a nucleus is considered one of the defining features of a eukaryotic cell. This structure is so important because it is the site at which the cell's DNA is housed and the ...

Bacteria are amongst the simplest of organisms – they are made of single cells. Their cell structure is simpler than the cells of animals, plants and fungi.

Cellular metabolism is the set of biochemical processes by which energy is either created or used in the cell, and energy resources in eukaryotic ... Scientists study the structure and function ...