GENBIO-1-CELL-THEORY.pdf

CELL THEORY CELL STRUCTURE GENERAL BIOLOGY I - STEM 11 Prepared by: Ms. Arlene C. Castillo MOST ESSENTIAL LEARNING COMPETENCIES 1. EXPLAIN THE POSTULATES OF THE CELL THEORY 2. DESCRIBE THE STRUCTURE AND FUNCTIONS OF MAJOR AND SUBCELLULAR ORGANELLES Seven Characteristics of Life 1. CA...

CELL THEORY CELL STRUCTURE GENERAL BIOLOGY I - STEM 11 Prepared by: Ms. Arlene C. Castillo MOST ESSENTIAL LEARNING COMPETENCIES 1. EXPLAIN THE POSTULATES OF THE CELL THEORY 2. DESCRIBE THE STRUCTURE AND FUNCTIONS OF MAJOR AND SUBCELLULAR ORGANELLES Seven Characteristics of Life 1. CAPABLE OF 2. CAPABLE OF GROWTH AND ENERGY AND DEVELOPMENT METABOLISM 3. CAPABLE OF 4. CAPABLE OF 7. COMPOSED OF HOMEOSTASIS ADAPTATION CELLS 5. RESPONDS TO 6. CAPABLE OF STIMULI REPRODUCTION  It shows signs that it gets bigger and more complex, or develops in any way. CAPABLE OF GROWTH AND DEVELOPMENT  It shows signs that it should be able to eat, digest food, and excrete or has energy storage and consumption. CAPABLE OF ENERGY AND METABOLISM  To be able to regulate and maintain a stable living conditions. CAPABLE OF HOMEOSTASIS  It should be able to adapt to the conditions of its environment or traits. CAPABLE OF ADAPTATION  It should be able to respond to stimulus. RESPONDS TO STIMULI  It should be able to produce offspring sexually or asexually. CAPABLE OF REPRODUCTION  It should be composed at least a single cell. COMPOSED OF CELLS  Discovery of the Cell 1590's Zacharias Janssen, a Dutch eyeglass maker, invented the very first microscope. (1580-1638)  Discovery of the Cell 1665 Robert Hooke used to look at thin slices of cork under a microscope. He observed thousands of tiny chambers and called them "cells". 1674 Anton Van Leeuwenhoek also observed tiny living organisms (he called it "animalcules") by using a microscope. 1831 Robert Brown compared various plant specimens under a microscope and indicated that there was a common thing about them - dark dense spot and called it "nucleus". THE CELL THEORY  - He was a German botanist and was the first one to recognize that cells were the fundamental unit 1838 of life (plant cells). - He studied Robert Brown's discovery of cell nucleus to his own observations to conclude that the nucleus is essential to cell division. - He also changed the study of botany from the purely systematic approach used since the days of Carolus Linnaeus (in which botany was simply about classifying of plants) to the analysis of plant structure and its functions. MATTHIAS SCHLEIDEN (1804-1881)  - He was a German physiologist and was the first 1839 one to recognize that cells were the fundamental unit of life (including animal cells). - When Schwann heard Schleiden's description of a plant cell, he realized that the animal cells that he had observed were very similar. Then, they went together to view and compare the similarities of the cells on their slides, including the presence of nuclei. - Through this discovery, he expanded Schleiden's plant cell theory to include animal cells. THEODOR SCHWANN (1810-1882) - He was a German physician who contributed the 1855 third tenet of cell theory. - One of Schleiden's claims was cells can be produced spontaneously through the process of crystallization. - Virchow corrected the theory of spontaneous generation of cells by Schleiden and proved the 3rd tenet which states that “Cells arise only from pre-existing cells.” or what we call the cell division. RUDOLF VIRCHOW (1821-1902)  THE CLASSICAL CELL THEORY 1 2 3 “Cells are the basic “All living things “Cells come from unit of structure are made up of pre-existing cells.” and function in an cells.” organism.”  THE MODERN CELL THEORY 4 5 6 “Cells carry genetic “All cells are basically “Energy flow material which is the same in structure (biochemical passed from cell to cell and chemical processes) occurs during cell division. “ composition.” within cells.”  Assignment No. 1 A. Draw and label the parts of the cell: Animal Cell Plant Cell B. What are the functions of each part of the cell? C. What is the difference between animal cell and plant cell? Explain.