The cell theory

The cell theory

THE CELL THEORY CELL THEORY FIRST PART Cell are the basic structural and functional unit of living organisms

LEVELS OF ORGANIZATION Cell -> Tissue -> Organ -> Organ System -> Organism LEVELS OF ORGANIZATION Cell the basic structural and functional unit of tissue Tissue a collection of cells of the same type that comes

together to perform a function Organ a collection of tissues which come together to perform a function Organ system a collection of organs that come together to perform a function

Organism a collection of organ systems CELL THEORY SECOND PART All living things are made up of cells containing DNA and RNA and

surrounded by a membrane CELL THEORY THIRD PART Cells arise from other cells TWO TYPES OF CELLS Prokaryotic cells

Always unicellular NO nucleus Free floating circular DNA NO organelles except ribosomes EX : Bacteria cells Eukaryotic cells two types : Plant and Animal Unicellular or multicellular

DNA enclosed in a nucleus Membrane bound organelles EX : plants, animals, protists, and fungi TWO TYPES OF CELLS ENDOSYMBIOTIC THEORY Bacteria began living

inside other bacteria and over time a dependence formed which created complex eukaryotic cells EVIDENCE FOR THE ENDOSYMBIOTIC THEORY

We see symbiosis between bacteria in modern species. Mitochondria and Chloroplasts have their own DNA Mitochondria and Chloroplasts have similar methods of reproduction as prokaryotic cells Mitochondria and chloroplasts have double membranes CELL THEORY RECAP

Cells are the basic structural and functional unit of living organisms All living things are made up of cells containing DNA and RNA and surrounded by a membrane Cells arise from other cells

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