Gen Bio 1 Class PDF

Welcome to our Gen Bio 1 Class! STEM_12_W1 SLIDESMANIA.COM  Lesson 1: The Cell Theory Objectives: 1. Describe the different postulates of the cell theory 2. Differen...

Welcome to our Gen Bio 1 Class! STEM_12_W1 SLIDESMANIA.COM  Lesson 1: The Cell Theory Objectives: 1. Describe the different postulates of the cell theory 2. Differentiate the classical and modern cell theory 3. Discuss the principles of the cell study and internalize the importance of the cell theory to us human beings. SLIDESMANIA.COM  What makes any living thing “alive”? SLIDESMANIA.COM  History of the Cell Theory SLIDESMANIA.COM  Robert Hooke (July 18, 1635–March 3, 1703) First coined the term “cells” Discovers cells in cork, then in living plant tissue using an early compound microscope. He coined the term cell (from Latin cella, meaning “small room”) SLIDESMANIA.COM  Like a Honey-comb Like compartments SLIDESMANIA.COM  Anton van Leeuwenhoek (24 October 1632 – 26 August 1723) Dutch scientist Teaches himself to make lenses leading to the invention of his own basic optical microscopes. Using his microscope, he was able to draw protozoa, such as Vorticella from rain water, and bacteria from his own mouth. SLIDESMANIA.COM  Anton van Leeuwenhoek A Dutch Naturalist who was an expert in grinding lenses and the one who discovered the tiny living organisms which he called “animalcules” from the drop of rain water. These animalcules are known as bacteria. Through his experiments, he was the first to relatively determine their size. SLIDESMANIA.COM  Anton van Leeuwenhoek Most of the "animalcules" are now referred to as unicellular organisms, although he observed multicellular organisms in pond water. He was also the first to document microscopic observations of muscle fibers, bacteria, spermatozoa, red blood cells, crystals in gouty tophi, and blood flow in capillaries. SLIDESMANIA.COM  Robert Brown Scottish botanist Identified nuclei in plant cells. Discovered the nucleus of the cell Introduced the phenomenon called Brownian movement. SLIDESMANIA.COM  Felix Dujardin (5 April 1801 – 8 April 1860) was a French biologist born in Tours. Discovered the a semi-transparent living substance known as Sarcode, in which later on was changed in protoplasm, the colorless materials comprising the living part of the cell. SLIDESMANIA.COM  Matthias Jakob Schleiden (5 April 1804 - 23 June 1881 aged 77) Was a German botanist and co-founder of cell theory, along with Theodor Schwann and Rudolf Virchow. He proposed on his studies about the entire parts of the plant and concluded that all plants are made out of cell. SLIDESMANIA.COM  Theodor Schwann (7 December 1810 – 11 January 1882) Was a German physician and physiologist. His most significant contribution to biology is considered to be the extension of cell theory to SLIDESMANIA.COM animals.  Henri Joachim Dutrochet French physiologist Suggested that the cell is not only a structural unit of life but also a physiological one. Wrote that all animal and plant tissues were aggregates of globular cells. SLIDESMANIA.COM  Robert Remak Polish scientist Disputed Schleiden’s hypothesis on the formation cells and claimed that cells arise from pre-existing cells through cell division. His major contribution to cell theory was the evidence that new animal cells arise by binary fission of pre-existing SLIDESMANIA.COM cells.  Rudolf Virchow (13 October 1821 – 5 September 1902) Polish scientist Father of Modern Pathology Stated that new cells come from pre- existing cells by cell division. Latin Phrase “ Omnis cellula e cellula” in his essay Cell Pathology His work became the main foundation of SLIDESMANIA.COM the Cell theory  The Cell is the smallest entity that exhibits the characteristics of life. SLIDESMANIA.COM  Cell Cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and SLIDESMANIA.COM began the scientific study of cells, known as cell biology.  The three tenets to the cell theory are as described below: 1. All living organisms are composed of one or more cells. 2. The cell is the basic unit of structure and organization in organisms. 3. Cells arise from pre-existing cells. SLIDESMANIA.COM SLIDESMANIA.COM  Modern Cell Theory: 1. All living organisms are composed of trillions of cell in their body. 2. Cell is fundamental and building blocks of all living organisms. 3. Cells come from the other cells by cell division. 4. The cell consists of genetic material which is passed from generation up to the last generation. 5. All cells are made up of the same in chemical SLIDESMANIA.COM composition.