Structure of Living Cell
Those who have life are living beings. Microorganisms, Plants and Animals have life, so they all are living beings. Cells are considered the fundamental units of life in division because they come in detached and simply identifiable packages. Living world is composed of microorganisms plants and animals. One or more cells make all living being. Cell is the structural and purposeful unit of living body. All sorts of reaction and anti- reaction in living body are cell centered. So to know about any living beings one should know about the living cell at first. All living cells are not alike. As they are, dissimilar in structure, they are different in size, shape and functions.
Fig: Generalized Plant and Animal Cells (Seen under Electron Microscope)
All the cells of Plants and Animals are eukaryotic but they have dissimilarities as well. However the major dissimilarity between them is the Plant cells have a non-living cell wall, which is missing in the Animal cells.
Cells are the least general denominator of life. Some cells are organisms unto themselves; others are division of multicellular organisms. All cells are made from the similar key classes of organic molecules: nucleic acids, proteins, carbohydrates and lipids.