6.12A: You will understand that all organisms are composed of one or more cells.

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Marsha Beasley
6 years ago
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1 TEKS: 6.12A, B

2 6.12A: You will understand that all organisms are composed of one or more cells. Purpose: You will get to see and identify the smallest unit of life! As well as learn about who discovered cells and cell theory. Your goal is

3 You will need to take a few notes, listen and I will tell you when to write down information. Title your page now: Cells and cell theory Note taking

4 Characteristics of Living Things You are surrounded by life, but how would you define a living thing? Living things: 1. are made of cells 2. Can reproduce 3. Use energy to survive 4. Have DNA 5. Respond to stimuli 6. Grow and develop 7. Use energy 8. Respond to stimuli 9. Maintain homeostasis 10. Evolve over time

5 A cell is the simplest structure of living things If an organism is unicellular, all functions of life happen within that one cell. If an organism is multicellular, the different cells have different jobs and they all work together Write down these bullets! All living things are made of cells

6 Simple Organisms Some organisms are simple: For example: Bacteria, Achaea, most protists (unicellular)

7 Complex Organisms Some organisms are more complex: Complex means that different parts of the organism performs different functions. Examples: humans, dogs, fish, mushrooms, oak trees

8 How do living things grow? Organisms grow by adding more cells, not by increasing the size of their cells Growth of an organism

9 What do cells look like? The word cell is Latin for small room They look as varied as the organisms they build (make up) Red Blood cell Stem Cell Brain cell Plant cell

10 Within the structure of cells, are parts that each have jobs to do The parts are called organelles Examples of organelles: Cells have parts

He noticed little compartments, which he named cells because they

11 1665 Robert Hooke published a book that described the cell 1. He looked at cork (a plant) under the microscope (30x) 2. He noticed little compartments, which he named cells because they resembled the little rooms that monks lived in The microscope led to the discovery of cells

He looked at pond water under the microscope (300x) and noticed that the water was

12 1675 Anton Van Leeuwenhoek is considered the father of microscopy because of the advances he made in microscope design and use. 1. He looked at pond water under the microscope (300x) and noticed that the water was full of moving living things 2. He made the most advanced microscope of his time The microscope led to the discovery of cells

13 Microscopes We use these to observe cells First compound microscope: What you will use!

14 With the invention of the microscope and the contributions of many scientists, a very important question was answered in the 1850 s. The question was: Where do cells come from? The answer? A Cell Theory was created!

15 The German scientists, Schleiden and Schwann developed The Cell Theory

16 Cell Theory There are 3 concepts: 1. All living things are composed of cells 2. Cells come from other (preexisting) cells 3. Cells are the basic structure of living things

18 In your Journal 1. Double check that your notes are complete. 2. Look at my example if needed.

19 Cells and Cell Theory is about Living organisms are organized into units called cells. More complex organisms are multicellular. Certain characteristics define whether or not something is living. Characteristics of Life (How do you know it is alive?) Living things 1. Are made of 2. Can 3. Use energy to 4. Have to pass on their genetics 5. Respond to in their environment 6. Grow and 7. Use 8. Maintain 9. over time. Cells A cell is the of living things All are made of cells Unicellular: All functions of life: Multicellular: The different cells: Simple organisms - Complex organisms - The word cell means: Cell parts are called: An ex. Robert Hooke 1. He looked at (a plant) under the microscope 2. He noticed little compartments, he called these is considered the father of microscopy. He looked at under a microscope. Cell Theory: Scientists: 3 concepts:

20 Brain Pop! All about cells!

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