A Sound Mind In A Healthy Body

CELL THEORY
CELL THEORY IS ONE OF THE BASIC PRINCIPLES OF BIOLOGY. CREDIT FOR THE FORMULATION OF THIS THEORY IS GIVEN TO GERMAN SCIENTISTS THEODOR SCHWANN (1810–1882), MATTHIAS SCHLEIDEN (1804–1881), AND RUDOLPH VIRCHOW (1821–1902).

THE CELL THEORY STATES:

ALL LIVING ORGANISMS ARE COMPOSED OF CELLS. THEY MAY BE UNICELLULAR OR MULTICELLULAR.

THE CELL IS THE BASIC UNIT OF LIFE.

CELLS ARISE FROM PRE-EXISTING CELLS. (THEY ARE NOT DERIVED FROM SPONTANEOUS GENERATION.)

THE MODERN VERSION OF THE CELL THEORY INCLUDES THE IDEAS THAT:

ENERGY FLOW OCCURS WITHIN CELLS.

HEREDITY INFORMATION (DNA) IS PASSED ON FROM CELL TO CELL.

ALL CELLS HAVE THE SAME BASIC CHEMICAL COMPOSITION.

IN ADDITION TO THE CELL THEORY, THE GENE THEORY, EVOLUTION, HOMEOSTASIS, AND THE LAWS OF THERMODYNAMICS FORM THE BASIC PRINCIPLES THAT ARE THE FOUNDATION FOR THE STUDY OF LIFE.

THE CELL MEMBRANE, ALSO CALLED THE PLASMA MEMBRANE, IS FOUND IN ALL CELLS AND SEPARATES THE INTERIOR OF THE CELL FROM THE OUTSIDE ENVIRONMENT. THE CELL MEMBRANE CONSISTS OF A SEMI-PERMEABLE LIPID BILAYER. THE CELL MEMBRANE REGULATES THE TRANSPORT OF MATERIALS ENTERING AND EXITING THE CELL.

GOLGI APPARATUS:

THE GOLGI APPARATUS IS AN ORGANELLE FOUND IN MANY EUKARYOTIC CELLS. THE GOLGI APPARATUS IS A CRITICAL COMPONENT OF THE ENDOMEMBRANE SYSTEM. IT IS LARGELY RESPONSIBLE FOR THE MODIFICATION AND PACKAGING OF DIFFERENT PROTEIN MOLECULES. THE GOLGI APPARATUS WILL RECEIVE SYNTHESIZED PROTEINS FROM THE ROUGH ENDOPLASMIC RETICULUM AND THEN MODIFY THEM POST-TRANSLATIONALLY FOR THEIR TRAFFICKED OFF TO THEIR DESTINATION.