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Cell Structure and Function

Explore the discovery of cells and the development of the cell theory. Learn about the different types of cells, their structures, and their functions. Discover how cells work together to create complex organisms and the levels of organization within living systems.

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Cell Structure and Function

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  1. Cell Structure and Function

  2. Essential Question • Why is the cell considered the basic unit of all life?

  3. Discovery of Cells • It wasn’t until the 1600s that scientists were able to use microscopes to observe living things.

  4. Cells • In 1665, Robert Hooke observed cork cells under the microscope. He called them cells. • This is a drawing he made of the cork cells.

  5. More Cork Cells • Here is what cork cells look like in a modern microscope with special lighting.

  6. Leeuwenhoek’s Microscope • Anton Van Leeuwenhoek used a single-lensmicroscope to view pond water and other things. • Here is his microscope.

  7. Cell Theory The Cell Theory States • All living things are made of cells. • Cells are the basic units of structure and function in living things. • New cells are produced from existing cells. • It wasn’t long before scientists realized that all living things were made up of cells. This discovery brought about the formulation of the cell theory.

  8. Types of Cells • Cells are classified as prokaryotic or eukaryotic. • Prokaryotic cells have genetic material that is not inside a nucleus. No nucleus. • Eukaryotic cells have genetic materials in a nucleus. (“true” nucleus)

  9. Cell Structures • Cells contain small structures called organelles. Each organelle has a specific job it performs in the cell.

  10. 1.The Nucleus • This is a membrane-bound structure that contains the DNA. DNA is the genetic material that is the code for making proteins. Chromatin is the complex combination of DNA and proteins that makes up chromosomes. EX: Chief Executive Officer (CEO) Found: Both

  11. 2. Ribosomes • Ribosomes are proteinassembly organelles. • Ribosomes can be “free” in thecytoplasm or on the endoplasmic reticulum. • EX: Workers in the assembly line • Found: Both

  12. 3. Endoplasmic Reticulum • The endoplasmic reticulum is the site where lipids of the cell membrane are assembled, along with proteins and other materials. • It can contain ribosomes and be Rough ER or have no ribosomes and be Smooth ER EX: Assembly line (where workers do their work) Found: Both

  13. 4. Golgi Apparatus • The golgi apparatus modifies, sorts, and packages proteins and other materials from the ER. EX: Finishing / packaging department Found: Both

  14. 5. Lysosomes • Lysosomes are small organelles that contain enzymes. • These enzymes breakdown lipids, carbohydrates, and proteins into small molecules that can be used by the cell. • Lysosomes also remove “junk and clutter” in the cell. EX: Maintenance crew

  15. 6. Vacuoles • Vacuoles arestorage organelles.They store water, salts, proteins, etc. • Plants have a largevacuolethat helps plants support leaves and stems. • Example: Warehouse • Found: Both

  16. 7. Mitochondria • The mitochondria is the organelle that converts chemical energy from food into ATP to power cell processes. EX: Power plant Found: Both

  17. 8. Chloroplasts • Chloroplasts are organelles that capture sunlight energy and convert it into chemical energy in a process known as photosynthesis. EX: Power plant Found: Plants

  18. 9. Cell Membrane • The cell or plasma membrane surrounds the cell and regulates what enters and exits the cell. • Ex: shipping and receiving • Found: Both

  19. 10. Cell Wall • A rigid structure that surrounds the cell membrane and provides support for the cell. Turgor pressure pushes the cell membrane to the cell wall. Ex: Security Gate Found: Plants

  20. 11. Cytoplasm • The cytoplasm (cytosol) is the fluid outside the nucleus. It contains the organelles. • EX: factory floor where most of the products are assembled, finished, and shipped. • Found: Both

  21. 12. Centrioles • Centrioles are cylindrical bundles of microtubules that function in cell reproduction. • Found: Animals

  22. Division of Labor • In multicellular organisms, each cell has a specialized task to keep the organism alive. • Specialized cells include blood, muscle, heart cells, etc. • Living things are organized into the following hierarchy. 1.Cells 2. Tissues 3. Organs 4. Organ Systems 5.Organisms

  23. Macromolecules • Organelles • Cells • Tissues • Organs • Organisms • Populations • Communities • Ecosystem • Biosphere

  24. Levels of Organization 1. Macromolecules 2. Organelles • This chart shows the increasing complexity of organization from tiny molecules to the whole biosphere. 3. Cells 4. Tissues 5. Organs 6. Organisms 7. Populations 8. Communities 9. Ecosystems 10. Biosphere

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