Lesson 1.1 Cell Theory PDF

Lesson 1.1 Cell Theory General Biology 1[1/2] Science, Technology, Engineering, and Mathematics  Have you ever wondered how cells were discovered and how they govern the mechanisms of our day-to-day activities? 2 2  One brick has no...but bric...

Lesson 1.1 Cell Theory General Biology 1[1/2] Science, Technology, Engineering, and Mathematics  Have you ever wondered how cells were discovered and how they govern the mechanisms of our day-to-day activities? 2 2  One brick has no...but bricks, when significant purpose... combined together, become useful. 3 Similar to bricks, cells, when combined together, perform functions necessary for life. 4  Different scientists paved the way to propose theories about cells, the structural and functional unit of life. 5 5 How can one distinguish living organisms from nonliving entities? 6 Learning Competency At the end of the lesson, you should be able to do the following: Explain the postulates of the cell theory (STEM_BIO11/12-Ia-c-1). 7  Learning Objectives At the end of the lesson, you should be able to do the following: Describe the general features of the cell. Create a timeline of the discovery of the cell. Identify the three proponents of the cell theory. Analyze the three principles of cell theory. 8 Overview of the Cell Size of the cell as compared to other objects 9 Why are cells so small? Does their small size have something to do with their function? 10 Overview of the Cell Smaller size has higher surface area to volume ratio 11 General Functions of the Cell 12  General Functions of the Cell Regulation of the Homeostasis Internal Environment An organism’s ability to keep a Acquisition and constant internal state is called Utilization of Energy homeostasis. Responsiveness to Their Environment Maintenance of these conditions, is important because most cells of Protection and Support an organism require a specific set of conditions to function normally. 13  General Functions of the Cell Regulation of the Homeostasis Internal Environment Acquisition and Utilization of Energy Perspiration serve as the cooling system to remove excess heat in the body. Responsiveness to Their Environment Protection and Support Normal body temperature Shivering generates metabolic heat. 14  General Functions of the Cell Regulation of the Chemical Energy Internal Environment Acquisition and It is stored in the bonds present in Utilization of Energy food molecules, and it will be converted by the cells into more Responsiveness to Their Environment usable forms. Protection and Support 15  General Functions of the Cell Regulation of the Chemical Energy Internal Environment Acquisition and Energy is needed by various cells Utilization of Energy to perform their functions. ○ heart cells to pump blood Responsiveness to Their Environment ○ intestinal cells to digest food ○ skeletal cells to initiate motion Protection and Support ○ nerve cells to conduct information 16  General Functions of the Cell Regulation of the Responsiveness Internal Environment Acquisition and A cell must first be able to Utilization of Energy determine the changes that have taken place before Responsiveness to Their Environment deciding the necessary responses that will ultimately Protection and Support result in the maintenance of normal internal conditions. 17  General Functions of the Cell Regulation of the Responsiveness Internal Environment Acquisition and Utilization of Energy Responsiveness to Their Environment Protection and Support A tanned skin means more pigment is released in that area to impart protection to the underlying cells especially UV radiation that can damage DNA. 18  General Functions of the Cell Regulation of the Internal Environment Acquisition and Utilization of Energy Responsiveness to Their Environment Immune cells impart protection against Protection and Support pathogens and other foreign bodies that may enter the general circulation. 19  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Zacharias Janssen (1585–1632) invented the first primitive microscope. 20  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Robert Hooke (1635–1703) observed cork cells under a microscope. 21  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Francesco Redi (1626–1697) disproved the spontaneous generation theory. 22  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Anton van Leeuwenhoek (1632–1723) observed microorganisms by using his own practical microscope. 23  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Matthias Schleiden (1804–1881) proposed that all plants are composed of cells. 24  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Theodor Schwann (1810–1882) proposed that all animals are composed of cells. 25  History of the Development of Cell Theory Scientists who contributed to the development of cell theory Rudolf Virchow (1821–1902) proposed that all cells come from pre-existing cells. 26 How do you think were the works of different scientists compiled and synthesized to develop the cell theory? 27  The Three Principles of Cell Theory Principle 1: Every living organism consists of one or more cells. Organism may be unicellular (left) or multicellular (right) based on their level of complexity. 28 The Three Principles of Cell Theory Principle 2: The cell is the fundamental unit of life. It is the smallest structural and functional unit in all organisms. 29  The Three Principles of Cell Theory Principle 3: Cells come from pre-existing cells. Cells contain hereditary material, which they pass to their daughter cells when they divide. 30