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What Do All Living Things Have In Common? They are all made of cells!! From the smallest organism, or living thing, to the largest, we are all made of cells. What is a Cell? A cell is the smallest unit that is capable of performing life functions. What is a Cell? Since the cell is the smallest unit of living matter, the processes of life must be carried out by the cells. Important Information About Cells • All living things are made up of cells. • Cells are the smallest working units of all living things. • All cells come from preexisting cells through cell division. What Functions Do Cells Perform? • Some cells make food. • Some cells release energy for other cells to use. • Some cells transport materials within an organism. • Some cells carry oxygen throughout the human body. • Some cells help fight against infection. • These are just some of the MANY jobs performed by cells!! What Are Living Things Made Of? • Some organisms are made of just one cell. • Other organisms are made of many similar cells that benefit from cooperating. All Organisms are either: Unicellularconsist of a single(one) cell and perform all life processes within a single cell Or Multicellularconsist of more than one cell (many) and have different cells that perform special functions in the organism Examples of Cells Amoeba Proteus Plant Stem Bacteria Red Blood Cell Nerve Cell • Made of one cell • The one cell performs all life functions • Usually only seen with a microscope • Includes amoebas, bacteria and protozoa Images of Unicellular Organisms More Images of Unicellular Organisms Examples of Unicellular Organisms • Amoeba • Unicellular fungi • Bacteria • Unicellular yeasts • Protozoa • Paramecium • Unicellular algae • Made of many cells • Different cells perform different functions • Can be seen by the naked eye (this means without help or microscopes) • Includes all plants and animals • Only surface cells come in contact with the external environment. Examples of Multicellular Organisms • Humans • Cats • Dogs • Insects • Birds • Flowers • Mold • Trees Images of Multicellular Organisms So, What’s the Difference? Unicellular • Made of one cell • The one cell performs all life functions • Usually only seen with a microscope • Bacteria, yeast, amoebas… • Main purpose is to survive Multicellular • Made of many cells • Different cells perform different functions • Can be seen by the naked eye • Plants, animals… • Main purpose is to work together with other cells in order to support the life of an organism So, How Are They Alike? • • • • Unicellular and Multicellular Made of cell(s) Both need food for energy Both need food for growth Both responsible for life functions Levels of Cell Organization • Cells are the smallest living part of an organism • Cells that work together with the same job form tissue • Tissues of different kinds come together to make an organ • A group of organs that work together to do a certain job makes up an organ system Which Type of Organism Am I? Which Type of Organism Am I? Which Type of Organism Am I? Which Type of Organism Am I? Which Type of Organism Am I? Which Type of Organism Am I? Deep in the Mariana Trench, about seven miles below the surface, researchers found huge single celled amoebas, making them not only completely surprising and amazing, but also the creatures living at the biggest depth found so far. Which Type of Organism Am I? Click on the following Links to read more information about cells • #1Learn more about • #Learn more about the discovery of the discovery of cellscells• Read-”What is the • Watch the following basic unit of life?” video about cellsand “How is life organized around cells?” Now, Let’s Answer Some Questions! Why is an animal considered to be multicellular? How can we best describe a panda bear? Why are single celled organisms able to survive? Name two examples of unicellular organisms? Name three examples of multicellular organisms?