The Development Of Light And Electron Microscope - 1608 Words

The first ever cell was discovered by Robert Hooke in 1665. He discovered them under microscope with very thin slice of cork and he saw different world live in it, and because of this experiment he called them cells. The first person to witness live cell was Antony Lan Leeuwenhoek, although first man to make microscope was Zacharias Janssen. In biology, cell theory is experimental theory which illustrates properties of cell. It was developed by three German scientist’s discoveries, they are Mathias Schleiden, Theodor Schwan and Rudolph Virchow. The cells are basic unit of structure in all living organism and as well as unit of reproduction with steady improvements made to microscopes over time. The development of light and electron†¦show more content†¦They perform same kinds of functions and in same way. They both are confined by selective barrier known as plasma membrane, surrounded by cytoplasm and full of small structures called ribosomes. They both have DNA that carries genetic information for operating the cell. Humans are Eukaryotes! Eukaryotic cells are far larger and more complex than prokaryotes cells. They are typically 10-100m in diameter and these cells are found in animals and plant cells. They contain many organelles. The eukaryotic cell has often been compared to a factory where different machines and peoples have different jobs , all are working together with one purpose. Efficiency is improved by division of labour, the sharing out of jobs. The cell as whole is divided into compartments celled compartmentation. Eukaryotic cells have a true nucleus enclosed by double membrane and communicate with cytosol via nuclear pores. The purpose of this nucleus is to set apart DNA related functions of big eukaryotic cells into smaller chamber and within this nucleus is nuclear chromatin that contains organisms genome. DNA stores organisms entire genetic information. DNA is usually linear and complexed with proteins called histones. Eukaryotes have larger ribosomes such as 80s. Ribosomes are made out of special class of RNA molecule. The existence of ribosome is temporary after synthesis of polypeptide chains two subunits separate and break. Eukaryotic cells have cytoplasm that is filled with