AGENDA – 9/25/2015 • Take out science journal and pick a new seat next to someone new! Bell-Ringer: Cells Introduction to Cells notes Closing: Double Bubble Map – Pro vs. Eu Homework: – Watch “Crash Course: Animal Cells” and “Endosymbiosis in Plain English” videos on Moodle! Bell-ringer: 9/25/15 1. Pair up in 2’s or 3’s. Look at the two pictures of cells (“A” and “B”). Discuss differences and similarities. Write down your ideas in your bell-ringer box. Today’s Objectives: • Identify the similarities and differences between prokaryotic and eukaryotic cells CELLS Cells are the building blocks of all living things. Your body contains different structures and organs that each have a specific job. In the same way, cells have different structures and organelles (tiny organs) that each have their own specific function (job) which helps the cell survive. Some organelles have a protective layer (or membrane) around them. mitochondria Other organelles don’t have a membrane around them. ribosome First to View Cells • In 1665, Robert Hooke used a microscope to examine a thin slice of cork (dead plant cell walls) • What he saw looked like small boxes copyright cmassengale 7 CELLS • After cells were discovered under a microscope, several scientists came together and made what is called the cell theory CELLS The cell theory is made up of three main ideas: All living things are composed of one or more cells. Multi-cellular organism Uni-cellular organism CELLS The cell is the basic unit of organization of living things. CELLS All cells come from preexisting cells(cells divide and make new cells). ENDOSYMBIOTIC THEORY • In 1970, American biologist, Lynn Margulis, provided evidence that Mitochondria and Chloroplasts were at one time free living cells themselves • Supporting evidence included organelles with their own DNA copyright cmassengale 12 TWO TYPES OF CELLS Cells are divided into two groups: PROKARYOTIC CELLS 1. SIMPLE CELLS 2. NO NUCLEUS, DNA floats around in the center of the cell “PRO” RHYMES WITH “NO” - “No Nucleus” ORGANISMS MADE OF THESE CELLS: ONLY BACTERIA TWO TYPES OF CELLS Cells are divided into two groups: EUKARYOTIC CELLS 1. COMPLEX CELLS 2. HAVE A NUCLEUS, DNA is found enclosed inside the nucleus 3. HAS “MEMBRANE- BOUND” ORGANELLES “EU” – “YOU” ARE MADE OF EUKARYOTIC CELLS EUKARYOTIC CELLS Organisms made of eukaryotic cells: (Everything EXCEPT bacteria) - Protists - Fungi - Plants - Animals Genetic Material The master set of directions for making proteins (making you) is contained in DNA. Prokaryotic cells only have one long strand of DNA Eukaryotic cells have different amounts of DNA (depending on what type of organism it is). Cell Control Center In prokaryotic cells, the DNA is found floating in the middle of the cell…. In eukaryotic cells, DNA is found inside the nucleus. Cell Control Center Just as every team needs a leader, the cell needs a leader to give directions. Nucleus The nucleus is the leader of the eukaryotic cell because it contains directions to make proteins. Every part of the cell depends on proteins, so by containing the blueprints to make proteins, the nucleus controls the actions of all the organelles. Homeostasis Inside the cell Outside the cell Plasma membrane Plasma membrane • The plasma membrane (also called cell membrane) is a “skin” that covers the cell. • All cells (prokaryotic and eukaryotic) have a plasma membrane. • Tape/glue in your Intro to Cells Notes 1. Create a double bubble map in your journal for “Prokaryotic cells vs. Eukaryotic cells.” 2. For homework, you need to watch the “Crash Course: Animal Cells” and “Endosymbiosis in Plain English” videos on Moodle. ** IN COMMON** ** IN COMMON** PROKARYOTIC CELL EUKARYOTIC CELL ** IN COMMON** ** IN COMMON** A. B.