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THE ORIGIN AND EVOLUTION OF CELL
Transcript of THE ORIGIN AND EVOLUTION OF CELL
Cell is the basic structural, functional, and biological unit of all living things
PART OF CELLS
Plasma membrane (cell membrane)
Scientist that contributed Cell Theory
Anton van Leeuwenhoek
The first cell
THE ORIGIN AND EVOLUTION OF CELL
DIFFERENT BETWEEN PANT AND ANIMAL CELLS
ANATOMY OF CELL
In 1665, the English physicist Robert Hooke looked at a sliver of cork through a microscope lens and noticed some "pores" or "cells" in it. Robert Hooke believed the cells had served as containers for the "noble juices" or "fibrous threads" of the once-living cork tree. He thought these cells existed only in plants, since he and his scientific contemporaries had observed the structures only in plant material.
Robert Hooke wrote Micrographia, the first book describing observations made through a microscope. The drawing to the top left was created by Hooke. Hooke was the first person to use the word "cell" to identify microscopic structures when he was describing cork. Hooke also wrote Hooke's Law -- a law of elasticity for solid bodies.
German physiologist who served as an assistant to Johannes Müller. He discovered the digestive enzyme pepsin in 1836. He showed that yeast were tiny plant-like organisms, and suggested that fermentation was a biological process. Schwann was a master microscopist who examined animal tissue, specifically working on notochord development in tadpoles. In "Mikroskopische Untersuchungen über die Übereinstimmung in der Struktur und dem Wachstum der Thiere und Pflanzen" ("Microscopic researches on the Conformity in Structure and Growth Between Animals and Plants," 1839), he recognized nuclear structures similar to what Schleiden had observed in plants. In 1839, he extended Schleiden's cell theory to animals, stating that all living things are composed of cells. He believed that new cells form principally outside pre-existing cells, and wanted to draw an analogy to crystal formation.
The father of microscopy, Anton Van Leeuwenhoek of Holland (1632-1723), started as an apprentice in a dry goods store where magnifying glasses were used to count the threads in cloth. Anton van Leeuwenhoek was inspired by the glasses used by drapers to inspect the quality of cloth. He taught himself new methods for grinding and polishing tiny lenses of great curvature which gave magnifications up to 270x diameters, the finest known at that time.
These lenses led to the building of Anton Van Leeuwenhoek's microscopes considered the first practical microscopes, and the biological discoveries for which he is famous. Anton Van Leeuwenhoek was the first to see and describe bacteria (1674), yeast plants, the teeming life in a drop of water, and the circulation of blood corpuscles in capillaries. During a long life he used his lenses to make pioneer studies on an extraordinary variety of things, both living and non-living, and reported his findings in over a hundred letters to the Royal Society of England and the French Academy.
German pathologist who studied under Johannes Müller. Virchow opposed the idea that disease was an affliction of the body at large or one of its humor, wanting to find the anatomical location of diseases. In Die Cellularpathologie (Cellular Pathology, 1858), he set out methods and objectives of pathology and demonstrated that cell theory applied to diseased tissue as well as healthy. He summarized the cell theory with the Latin phrase "omnis cellula a cellula" (all cells arise from cells) in 1855. However, he did not accept Pasteur's germ theory, and in later life devoted himself to archaeology and anthropology, forming a close friendship with Schliemann and collaborating in the excavation of Troy.
German botanist and master microscopist who was influenced by Schelling's Naturphilosophie and the writings of Oken. He worked under Johannes Müller and studied primarily cells in plants. He observed that all plants seemed to be composed of cells, and is thus considered the co-founder of cell theory together with Schwann, with whom he consulted. Schleiden wanted to make cell formation analogous to crystal formation, and published his results in Beiträge zur Phytogenesis (Contributions of Phytogenesis, 1838). Schleiden was a vitalist, and thought the cell was the center of the vital force vitalism theory.
Appears about 3.8 billion years ago
750 milliar after the earth was formed
First discovered by Robert Hooke
Miller & Urey
MOLECULE + lightning elcetricy and cosmic radiation
Basic living substance
Miller & Urey experiment
Described as :
- All living organisms are composed of 1 or more cells
-Cell is the basic unit of structure
- All cells come from pre-existing living cell
Examine thin slices of plant material
Chose cork > looks like pores
LEEUWENHOEK, SCHLEIDEN, SCHWAN, VIRCHOW + HOOKE
there's a relationsjip between cells and living things
THEORY CELL STATES:
-all living things are made of cells & their products
-New cells are created by old cells dividing into 2
- cells are the basic units of life
evolution of cell
The First Cell arose in pre-biotic world with the coming together of several entities carrying out three essential and quite different life processes.
-To copy informational macromolecules
-To carry out specific catalytic functions, and
-To couple energy from the environment into usable chemical forms
Each of these three essential processes already happened before prior to The First Cell, but only when these three occurred together was life jump-started and Darwinian evolution of organisms began.
Charles Robert Darwin(12 February 1809 – 19 April 1882)
All species of life have descended over time from common ancestors. The scientific theory that this branching pattern of evolution resulted from a process called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding
The origin of cells was the most important step in the evolution of life. The birth of the cell marked the passage from pre-biotic chemistry to discovery modern cells.