CELL ORGANIZATION & UNICELLULAR ORGANISMS Sections 2.1/2.2

Unicellular Organisms Multi-cellular Organisms Organisms made of more than one cell. Unicellular Organisms One celled organism..

CELL ORGANIZATION Cells Specialized cells to carry out specific functions Example. epithelial cells, muscle cells, nerve cells, fat cells Tissues Groups of cells that are similar in shape and function Example. The skin that covers the outside surfaces of you body is epithelial tissue. Organs Tissues that are organized into larger structures that have one function Example. Heart pumps blood through your body. Organs Systems Groups of organs that have related functions Example. Circulatory system includes the heart, arteries, capillaries, veins

Level of Cell Organization in the Human Body

UNICELLULAR ORGANISMS Another word for a unicellular organism is a micro-organism or a microbe because they are only visible under a microscope Carry out all of life’s functions (feeding, digesting, excreting, and reproducing), and yet it is only made up of one cell!

BACTERIA Among the most primitive and most plentiful organisms They are prokaryotic cells that have no nucleus, no mitochondria and no ribosomes found every where on Earth 100 trillion bacteria inside average human body 500 different types of bacteria in your mouth

PROTISTS neither plant nor animal eukaryotic cells having a nucleus mitochondria, ribosomes, and lysosomes Found wherever there is water such as pond water

Examples of PLANT-LIKE PROTISTS Contain chlorophyll and produce their own food by photosynthesis Diatoms: fresh and salt water and are encased in 2 thin shells Euglena: with sunlight produce their own food, without sunlight feed on smaller cells so are similar to both plant and animal cells Freshwater Diatoms Euglena

Examples of ANIMAL-LIKE PROTISTS Cannot make their own food and feed on living things or things that were once alive Amoeba Paramecium

FUNGI Include both unicellular and multicellular organisms Examples: bread mould, mushrooms, athlete’s foot Yeast is a unicellular fungus that feeds on other organisms Bread Mold Yeast budding

Mind Map Diagram of Unicellular Organisms Bacteria Diatoms Plant-like Yeast Euglena Fungi Protists Amoebae Animal-like Paramecia