Based on the structure of the plasma membrane, it is regarded as the fluid mosaic model. In an animal cell, the cell membrane functions by providing shape and protecting the inner contents of the cell.The plasma membrane is present both in plant and animal cells, which functions as the selectively permeable membrane, by permitting the entry of selective materials in and out of the cell according to the requirement.It is a selectively permeable membrane of the cell, which is composed of a lipid bilayer and proteins. The plasma membrane is also termed a Cell Membrane or Cytoplasmic Membrane.List of Cell Organelles and their Functions

Double membrane-bound organelles: Nucleus, mitochondria and chloroplast are double membrane-bound organelles present only in a eukaryotic cell.Single membrane-bound organelles: Vacuole, Lysosome, Golgi Apparatus, Endoplasmic Reticulum are single membrane-bound organelles present only in a eukaryotic cell.They are present both in prokaryotic cell and the eukaryotic cell. Organelles without membrane: The Cell wall, Ribosomes, and Cytoskeleton are non-membrane-bound cell organelles.There are various organelles present within the cell and are classified into three categories based on the presence or absence of membrane. A few of them function by providing shape and support, whereas some are involved in the locomotion and reproduction of a cell. They coordinate and function efficiently for the normal functioning of the cell. These cell organelles include both membrane and non-membrane bound organelles, present within the cells and are distinct in their structures and functions. The cellular components are called cell organelles. The cell contains different functional structures which are collectively called Organelles, and they are involved in various cellular functions. The cells provide shape, structure and carries out different types of functions to keep the entire system active.According to cell theory postulates, a cell is the basic building block of life, which makes anything alive and is self-sufficient to carry out all the fundamental functions of an organism. A cell is the basic structural and functional unit of a living organism.

Every single species is composed of a cell and it includes both single-celled and multicellular organisms.

More than 8.7 million species are living on the planet.

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