The Cell Definition In Biology: The fauna is diverse and consists of about 4 million species of different bacteria, protozoa, plants, and animals. No matter how complex the structure of plant and animal bodies is, there is a fundamental relationship between all of them, such as — everyone’s body is made up of one or more cells.
Example: The body of protozoa is made up of a single cell, with many cells gradually forming tissues, organs, systems, and finally a multicellular organism. Thus the cell is the structural and functional unit of the organism; For example, the unit of the chemical composition of matter is the atom.
cell definition in biology
Cell Definition In Biology: The biochemical analysis of the cell shows that the cell contains various organic elements such as proteins, fats, sugars, nucleic acids, etc., and also some inorganic elements. All these elements participate in various biological processes or metabolic processes in the exchange of energy and similarity is found in all the cells. Thus the cell is also considered a unit of life-based on the similarity of the biochemical structure of each cell.
Cell Diagram: Although different cell sizes, shapes, and functions are different, each cell exhibits signs of life; That is, in every cell, there are some life processes such as arousal, metabolism, reproduction, growth, etc. The genetic code needed to express these signs of life is found in every cell in the same state, and if analyzed from this point of view, the cell can certainly be considered as the unit of life.
Defining cells as the primary unit of life is a very difficult task. The cell is generally called the structural and functional unit of life. That is, all the cells of all living things have structural similarity and functional similarities.
But the shape and structure of the cells of different organs are different; For example, the cells of the liver, the cells of the kidneys, the cells of the testicles, and the cells of the ovaries are of different shapes; Again, the function of these cells is also different. Thus beyond all exceptions, the definition of the cell can be given as follows.
[Cell Definition In Biology, Shape, Measurement, and Number]
Cell structure and function
1. The smallest structural and functional unit of an organism is called a cell.
2. The small part of the differentiated membrane protoplasm that is self-sufficient in a favorable environment and is able to reproduce is called a cell.
(b) Cell Structure: The cells of a multicellular organism have different shapes. However, the cells of a particular organ have the same shape. The shape of the cell can be round, cylindrical, quadrangular, irregular, etc. The shape of the cell depends on the function of the cell, the surface tension of the environment, etc.
(c) Measurement of Cell: Different types of cell measurement. Most cells are microscopic. The units used to measure cells are microns or Mio (\), millimicrons (mil), angstrom unit A or nanometer (nanometer = nm).
(d) Number of Cells: Lower-class organisms such as bacteria, protozoa, and some algae are made up of a single cache. The number of cells depends on the size of the multicellular organism. Inferior people give birth to inferior offspring and, thus, propagate their inferiority.
Discovery Of Cells
Various scientists have contributed a lot to the discovery of cells and cell organelles and have finally published many theories on the theory of Cells. The contribution of some of the leading scientists in this review is discussed.
The Cell Definition In Science
1. Aristotle (Aristotle, 384 – 322 B. C.): Explains the concept of single structure in biodiversity.
2. Leonardo de Vinci (Leonardo de Vinci, 1452–1519): The first to mention the use of lenses for the observation of objects.
3. Francis Janssen and Zacharias Janssen (Francis Janssen and Zacharias Janssen, 1590): The Janssen brothers, spectacles sellers, were the first to make composite microscopes with the help of two different lenses.
4. Galileo Galilei (Galileo Galilei, 1613): Galileo Galilei observed small animals and aquatic plants with the help of a microscope.
5. Robert Hooke (Robert Hooke, 1665): Robert Hooke observed the thin cut of cork with the help of his own advanced compound microscope. He saw a number of cells in the hive according to the beehive and named these cells Kosh (Cell, L. Cella = hollow shell). His idea was that there was nothing inside the cells and that the cell wall was the only living thing.
6. Leeuwenhoek (1650-1700): Observes bacteria, protozoa, sperm, blood cells, and nuclei inside cells with the help of simple microscopes.
7. Robert Brown (Robert Brown, 1831): Robert Brown discovered the nucleus in plant cells.
4. Wagner (1832): Wagner discovered the nucleolus inside the nucleus.
9. Dujardin (Dujardin, 1835): Looks at the liquid in the cell according to the jelly and names it sarcode.
10. Purkinje (Purkinje, 1839): The semiconductor substance inside the Purkinje cell is called protoplasm.
11. Schleiden (Schleiden, 1838): Botanist Dan. Speaking of cells as a single.
12. Cyan (Schwann, 1839): Zoologist Cyan refers to the unit of the animal body as the cell.
13. Haeckel (Haeckel, 1866): Hele proves that the nucleus contains hereditary traits and moves from one lineage to the next.
14. Fleming (1880): Fleming describes the mechanism of mitosis and states that mitosis is the process by which cells maintain their lineage through cell division.
15. Waldeyer (Waldeyer, 1890): Waldeyer discovered and named the chromosome.
16. Hartwig (Hertwig, 1875): Hartwig states that during fertilization, the nucleus of the egg and the sperm come together and then the embryo is formed and its fertilization takes place. The method of meiosis cell division was discovered in the late nineteenth century. Scientists have shown that this reduction divides the number of chromosomes in a gamete by half, resulting in a fixed number of chromosomes in the zygote and in the full stage.
Brief descriptions of a few other prominent scientists who later discovered different types of cellular organelles or discussed the organelle are mentioned during the discussion of each cellular organelle.
How long do cells live?
The cells in your body are replaced every 7 to 10 years.
Who discovered the first human cell?
Robert Hooke in 1665,
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