IS CELL NECESSARY FOR LIFE ?
What is cells?
A cell is the smallest unit of life. Cells are often called the "building blocks of life. The study of cells is called cell biology. Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids.
What are the types of cells? Blood and immune system cells Erythrocyte (red blood cell) Megakaryocyte (platelet precursor) Monocyte (white blood cell) Connective tissue macrophage (various types) Epidermal Langerhans cell. Osteoclast (in bone) Dendritic cell (in lymphoid tissues) Microglial cell (in central nervous system)
IS CELL NECESSARY FOR LIFE ? Yes, all living organisms on planet earth require a cell because the cell is a basic structural and functional unit of life. They are STRUCTURAL UNIT as they form the structure of the organism. They are building blocks of life like bricks of building. Bricks combine to form walls, walls combine to form rooms which further combine to form one floor and floors combine to form building. In similar way, cells combine to form tissues, tissues combine to form organs which further combine to form organic systems and organ system combine to form organism. They are FUNCTIONAL UNIT as all the functions carried out by us are the functions carried out by cells. The human body is composed of trillions of cells. Some cells take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Some cells also contain the body’s hereditary material, so make copies of themselves. In unicellular organism single cell performs all of its life functions. In complex organisms, like plants and animals, millions of cells combine to form organs and perform different jobs
What are the two basic kinds of cells? There are two basic kinds of cells: prokaryotic cells and eukaryotic cells. Prokaryotes, bacteria and archaea, are simple cells that have no cell nucleus. They do have bacterial microcompartments. Eukaryotes are complex cells with many organelles and other structures in the cell.
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