CELL ORGANIZATION & UNICELLULAR ORGANISMS Sections 2.1/2.2 You are made up of an estimated 10-100 trillion cells that work together.

Prokaryotic & Eukaryotic Eukaryotic cells contain membrane-bound organelles, such as the nucleus, while prokaryotic cells do not. Differences in cellular structure of prokaryotes and eukaryotes include the presence of mitochondria and chloroplasts, the cell wall, and the structure of chromosomal DNA.

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 Diatoms Plant-like Yeast Euglena Protists Fungi Amoebae Animal-like Paramecia

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 plants nor animals They are eukaryotic cells having a nucleus mitochondria, ribosomes, and lysosomes Found wherever there is water or moisture Example. Pond water, moist soil

PLANT- LIKE PROTISTS Examples 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

ANIMAL-LIKE PROTISTS Examples 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 of Unicellular Organisms