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Killer Whale. Frog. Vs. 1. How does the size of a cell in a frog compare to the size of a cell in a whale?. 2. What makes a whale so much larger than a frog?. Cell History. van Leeuwenhoek. Hooke. Cell History. All life is made of cells Cells discovered after microscope invented

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Vs.

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  1. Killer Whale Frog Vs. 1. How does the size of a cell in a frog compare to the size of a cell in a whale? 2. What makes a whale so much larger than a frog?

  2. Cell History van Leeuwenhoek Hooke

  3. Cell History • All life is made of cells • Cells discovered after microscope invented • 1665: Robert Hooke first observed cork (dead tree bark) • Boxes he saw reminded him of tiny rooms • He named the empty boxes “cells”

  4. Cell Theory Schleiden • Three Parts: • 1) All organisms are made of cells • 2) The cell is the most basic unit of life • 3) Cells come from other cells • What’s the big problem with this theory? Schwann Where did the 1st ever cell come from? Virchow

  5. Cell Diversity • Shape depends upon function • ex: Nerve Shape: Elongated branching • Function: Sends messages to and from brain • ex: Red Blood Shape: Disc-like shape prevents clogging • Function: Carries O2 throughout blood • ex: Skin Shape: Flat & broad; layers overlap • Function: Covers and protects the body

  6. Cell Categories • 1) Prokaryote: Cells without a nucleus and other membrane-bound organelles • First cells/life on Earth (oldest fossils = ~3.5 b.y.o) • AKA: Bacteria

  7. 2) Eukaryote: Cells with a nucleus & membrane bound organelles More complex cells Evolved from prokaryotes Ex: Protists, Fungi, Plants, Animals Cell Categories

  8. Kobe Kuiz • Who first identified cells? • What was he/she examining? • Name the three parts to the cell theory. • Explain how the shape of a blood cell allows it to perform it’s job better. • Which category of cells contain nuclei? • Why are bacteria considered the oldest forms of life on Earth? • How do prokaryotes and eukaryotes differ?

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