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The Microscope

The Microscope. 7 th Grade Lab Activity. Do Now…. Which of the scientists who contributed to the development of the cell theory do you think is the most important? Explain your thoughts. . Objectives. Students will… Learn the names of microscope parts Learn how to use a microscope

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The Microscope

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  1. The Microscope 7th Grade Lab Activity

  2. Do Now… • Which of the scientists who contributed to the development of the cell theory do you think is the most important? Explain your thoughts.

  3. Objectives • Students will… • Learn the names of microscope parts • Learn how to use a microscope • Prepare objects for viewing under a microscope • Examine several objects under a microscope • Determine how the lens system of a microscope changes the position of an object being viewed

  4. The Microscope • A microscope is a scientific tool used to see very small objects. • Objects you cannot see with your eyes alone can be seen using a microscope. • In this experiment you will look at a small letter e cut from a magazine, some thread and a strand of hair. • Activity will be completed in partners • Please read through the lab carefully and follow all directions. • Review how to prepare a slide.

  5. Partner Pairs • Anna/Gabby • Maddie/Caroline H. • Megan/Julia • Caroline K./Rachel • Abby/Gabrielle • Salvo/Owen • Ryan/Jake • Greyson/Michael S. • Michael C./Sean

  6. For Next Time…. • Read pgs. 232-235. • Finish lab if needed.

  7. Viruses 7th Grade

  8. Do Now… • Define bacteria, virus and host cell on index cards.

  9. Objectives Students will… • Explain how a virus makes copies of itself • Identify the benefits of viruses • Investigate some uses of viruses

  10. What are viruses? • A virus is a strand of hereditary material surrounded by a protein coating. • They don’t have a nucleus, other organelles or a cell membrane. • A virus multiples itself by making copies with help of a living cell a called a host cell.

  11. Active Viruses pg. 232

  12. Inactive Viruses • Some viruses can be inactive and are called latent. • Latent means that after the virus enters the host cell, its hereditary material becomes part of a host cell’s hereditary material. • It does not immediately cause the host cell to make new viruses or destroy it. • Ex: Cold sores-virus stays in people forever but only causes symptoms once and a while.

  13. How do viruses affect organisms? • Viruses affect many living things. • Most viruses only affect specific kinds of cells---limited to only one host species. • This is why humans can have viruses that don’t affect other animals or plants and vice versa. • A few viruses affect a broad range of hosts like the rabies virus. • A virus cannot move by itself, but can reach a host’s body in several ways. • 1) Carried by wind • 2) Inhaled by animal • Finally, viruses and the attachment sites of the host cell must match exactly, like a puzzle.

  14. Treating and Preventing Viral Diseases

  15. Research with Viruses • Gene therapy/transfer is one way that viruses are helpful. • 1) Normal hereditary material is enclosed in viruses. • 2) The viruses infect the defective cells • 3) New hereditary materials enter the cells and replace the defective hereditary material.

  16. Research with viruses • An active area of viral research is HIV/AIDS research. • HIV= Human immune-deficiency virus, a virus that attacks the immune system. • AIDS=Acquired Immune Deficiency Syndrome. • A weak immune system means the body cannot fight other diseases or infections like pneumonia and certain types of cancer. • Currently, there is no known cure for AIDS.

  17. Videos • Introduction to Viruses • Viruses

  18. For Next Time… • Complete Virus Worksheet (Reinforcement)

  19. Lab: Comparing Cells 7th Grade

  20. Do Now Together • http://safeshare.tv/w/lREZUFZLHk (Cheek Cell Preparation) • http://safeshare.tv/w/ptwfmpHfpL (Elodea Plant Preparation)

  21. Objectives • Students will… • Compare and contrast an animal cell (cheek cell) and a plant cell (elodea).

  22. Partner Pairs • Anna/Gabby • Maddie/Caroline H. • Megan/Julia • Caroline K./Rachel • Abby/Gabrielle • Salvo/Owen • Ryan/Jake • Greyson/Michael S. • Michael C./Sean

  23. Lab: Comparing Cells • Review lab procedures/directions/precautions • Carefully review the lab with your assigned lab partner (same from microscope lab) • Answer lab preview questions. • Prepare cheek cell/elodea cell slides. • View slides under microscope according to lab directions. • Complete lab questions.

  24. For Next Time… • Have fun at the Christmas Concert Tonight 

  25. Comparing Cell Lab (Part 2) 7th Grade

  26. Do Now… • With your lab group, complete the virus enrichment worksheet.

  27. Lab: Comparing Cells • Review lab procedures/directions/precautions • Carefully review the lab with your assigned lab partner (same from microscope lab) • Answer lab preview questions. • Prepare cheek cell/elodea cell slides. • View slides under microscope according to lab directions. • Complete lab questions.

  28. Cell Videos • Crash Course Animal Cells • Crash Course Plant Cells

  29. For Next Time… • Complete Chapter 8 Review #1-20 pg. 240 in science notebook. • Study for test on Thursday, 12/19.

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