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Bell Work

Bell Work. What is a cell? What scientist first discovered the cell? What scientists were responsible for the cell theory?. Biology – Lecture 34. Cellular Function. Cells. Cells are unique to each type of organism. What do Cells have in Common?.

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Bell Work

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  1. Bell Work • What is a cell? • What scientist first discovered the cell? • What scientists were responsible for the cell theory?

  2. Biology – Lecture 34 Cellular Function

  3. Cells • Cells are unique to each type of organism.

  4. What do Cells have in Common? • Cells are compartments surrounded by some type of membrane.

  5. Cellular Function • All cells have a purpose. • If they don't do anything productive, they are not needed anymore. • When alone, a cell's main purpose is to survive.

  6. What helps a Cell Survive? • Organellesare groups of complex molecules that help a cell survive. • In the same way that cells survive in different ways; all cells have different types and amounts of organelles.

  7. Cell Size and Organelles • The larger a cell becomes the more organelles it will need.

  8. Cell Survival • More advanced cells have a difficult time surviving on their own.

  9. Example • A cell from your brain could not survive in a Petri dish for long. • It doesn't have the right pieces to live on its own. • It does have the ability to transmit electrical systems around your body.

  10. Example • An amoeba could survive in a dish forever, thrive, and reproduce. • It could not, however, send electrical impulses. • The brain cell is far more advanced than the ameba and has specific abilities and organelles.

  11. Cell Survival vs Cell Task • Simpler cells have a better chance of surviving on their own while complex cells can accomplish tasks that are more advanced.

  12. Would it be better to have more advanced cells or less advanced cells?

  13. A Cell’s Purpose • A main purpose of a cell is to organize. • Cells hold a variety of pieces and each cell has a different set of functions.

  14. What do Cell’s Do? • http://www.johnkyrk.com/er.html

  15. How do Cells Replicate? • Replicate means to reproduce. • Cells do this through mitosis and meiosis

  16. Mitosis • The duplication process: • It produces two genetically identical "daughter" cells from a single "parent" cell.

  17. Examples of Mitosis • Mitosis replaces cells lost through everyday wear and tear • Replacing skin cells occurs through mitosis • Mitosis takes place in cells in all parts of your body, keeping your tissues and organs in good working order.

  18. Meiosis • Generates daughter cells that are distinct from one another and from the original parent cell

  19. Meiosis • Although virtually all of your cells can undergo mitosis, only a few special cells are capable of meiosis: those that will become eggs in females and sperm in males.

  20. The difference between the two: • Mitosis is for growth and maintenance, while meiosis is for sexual reproduction.

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