Everything around us is composed of atoms and molecules, yet some things are alive, and others are not. Where does life begin? It begins with its smallest structural unit – the cell!

A cell possesses all the defining characteristics of life: metabolism, growth, reproduction, response to stimuli, and motility. Cells can be part of a multicellular organism, or they can exist as independent, self-sustaining organisms. Every cell is intricately structured, but its most vital capability is the preservation and transmission of genetic information from one generation to the next.

In eukaryotic cells, this information is safeguarded within the nucleus – a specialized structure that directs all cellular processes and ensures the precise replication of DNA during division. In prokaryotes – cells lacking a nucleus – the genetic information resides directly in the cytoplasm, which in no way prevents them from functioning as fully fledged living organisms.

Let’s begin our exploration of life with its smallest structural unit. Are you with us?