Complete the T/F questionnaire at the top of your notes Announcements: I will hand out your tests and scores in a few. Do this first. Catalyst Complete the T/F questionnaire at the top of your notes

Catalyst False; there are more than 100 TRILLION (100,000,000,000) 1. There are approximately 10 billion cells in the human body. 2. You have billions of bacteria inside your body right now. 3. Cells are about the size of atoms. 4. It is unhealthy to eat food containing microorganisms (microscopic living things). 5. Microorganisms cannot live in extreme heat or cold. False; there are more than 100 TRILLION (100,000,000,000) True! False! They are WAY bigger! False! (sometimes) False!

Catalyst False! They make up 10%! True! True! 6. Bacteria make up about 1 percent of your dry body weight. 7. Microorganisms produce some of the oxygen we breathe. 8.There are over 350 species of bacteria living inside your mouth. 9. Antibiotics kill viruses. 10.The bubonic plague bacteria was responsible for killing one-third of the population in Europe. False! They make up 10%! True! True! False! They kill bacteria True!

Remember…. In previous lessons we talked about the characteristics shared by all living things. MR. H CREG 2. One of those characteristics was that ALL living things are made of cells

Remember: Next Quiz is Friday!

Guided Reading Read the passage, and answer the questions. In a few minutes, you will be able to discuss it with your partner.

Biology Activity After the reading, you will make a timeline showing the discovery of cells and the cell theory. Use the book. Read pgs 182-184, 256. Your timeline must at minimum include… -invention of microscope -Hooke -Leeuwenhoek -Schleiden/Schwann/cell theory -electron microscope invention (pg 184) -stem cell discovery (pg 256)

Guided Reading 1. What tool was necessary for scientists to learn more about organisms? 2. Why did Robert Hooke call his discovery cells 3. What was Anton van Leeuwenhoek’s contribution to science? 4. Which German observed plants? Which observed animals? 5. Are you multicellular or unicellular? How do you know?

Cells

The Cell Theory 1. Cells are the basic unit of structure and function in organisms.

Multicellular (made of many cells) Unicellular (made of one cell) The Cell Theory 2. All living things are made of one or more cells Multicellular (made of many cells) Unicellular (made of one cell)

The Cell Theory 3. All cells come from preexisting cells

That’s what I am made of… Draw what you think an organism looks like under a microscope

Organization of Living Organisms Non-Living Levels ATOMS  MOLECULES  ORGANELLES

Organization of Living Organisms Living Levels CELL (Simplest form of life)  TISSUES (Similar cells working together)

More Living Levels ORGANS: Complex ORGANISM ORGAN SYSTEMS: Complex ORGANISM Different organs working together  Different tissues working together  copyright cmassengale

**A little bit of help** For each organelle I will give you its DEFINITION and its FUNTION. The DEFINITION is a short description of what it looks like, where it is found and how we can recognize it. Definition of an iPOD: a small technological device that comes in a variety of colors and contains songs that you can play. The FUNCTION is what it does…it’s purpose. Function of an iPOD: an iPOD is used to play music and is often used when someone is studying, exercising or other times. It is small so it can be carried around.

All Cells A. Tend to be microscopic… what kind of cell can you see without a microscope?? B. Have a few key structures: i. are enclosed by a membrane. ii. are filled with cytoplasm. iii. Contain ribosomes cell membrane Bacterium (colored SEM; magnification 8800x) cytoplasm

1. Plasma Membrane We are in Room 132 Our classroom is not part of the hallway, outside, Mrs. Gayle’s classroom, or Mr. Bryce’s classroom….how do we know? Room F103 has a barrier that separates us from our neighbors and the outside environment How did we get inside Room F103? We walked through the door!

1. Plasma Membrane A cell’s plasma membrane is a bit like our classroom walls and door A cell’s survival depends on maintaining a balanced internal environment WHAT IS THIS CALLED AGAIN? The plasma membrane helps a cell to wanted things inside and unwanted things outside Homeostasis!

1. Plasma Membrane DEFINITION: Thin, flexible boundary between a cell and its watery environment FUNCTION: Responsible for homeostasis in a cell (Keeping things in and out of the cell)

2. Cytoplasm DEFINITION: A gooey liquid that fills the cell and acts as support All organelles except nucleus float in the cytoplasm FUNCTION: It supports the cell… kind of like bubble wrap or packing peanuts protect a package.

3. Ribosomes Definition: small organelle made mostly from rRNA (ribosomal RNA) attached to endoplasmic reticulum or free in cytoplasmic liquid. Function: makes proteins

Exit Ticket

Question 1 Which organelle makes proteins and is located in the cytoplasm or on the surface of ER? A) nucleus B) nucleolus C) ribosome D) endoplasmic reticulum

Question 2 All living things are composed of cells Which of the following is not part of the cell theory? All living things are composed of cells All living things are made of multiple cells New cells come from existing cells Cells are the basic unit of structure and function of living organisms

Question 3 An organism made up of only one type of cell What is a unicellular organism? An organism made up of only one type of cell Any species composed of cells Organism made of only one cell An animal that is very hard to see

Question 4 Which sequence represents the correct order of organization in complex organisms? Tissues  Organs  Systems  Cells Organs  Tissues  Systems  Cells Systems  Organs  Cells  Tissues Cells  Tissues  Organs  Systems

Question 5 What are the dependent and independent variables in an experiment? Independent does not change, dependent changes Independent and dependent are basically the same. The independent is controlled by the experimenter, the dependent is controlled by the independent. The independent is controlled by the dependent, the dependent is controlled by the experimenter.