GENERAL KNOWLEDGE

Detailed explanation-1: -Then, in the 1950s, a new type of the microscope was invented. Called the electron microscope, it used a beam of electrons instead of light to observe extremely small objects. With an electron microscope, scientists could finally see the tiny structures inside cells.

Detailed explanation-2: -The internal structure of cells is studied by transmission electron microscopy, which allows cell organelles to be visualised. Immunoelectron microscopy allows the localisation of molecules to specific parts of cells.

Detailed explanation-3: -Because most cells are too small to be seen by the naked eye, the study of cells has depended heavily on the use of microscopes.

Detailed explanation-4: -Cell structure consists of the whole cell with the cell membrane, nucleus, ribosomes, Golgi bodies which are dispersed in the cytoplasm of a cell. So basically these are cytoplasmic structures which are so tiny that they can only be observed under the microscope.