Cell History van Leeuwenhoek Hooke.

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Presentation transcript:

Cell History van Leeuwenhoek Hooke

Cell History All life is made of cells Discovered after microscope invented 1665: Robert Hooke first observed cork (dead plant bark) Cork reminded him of tiny rooms He named the empty boxes “cells”

Cell Theory Schleiden Schwann Virchow 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 Virchow

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

Cell Categories 1) Prokaryote: Cells without a nucleus and other membrane-bound organelles Oldest cells known (~4 billion years old) Believed to have evolved first (oldest fossils) AKA: Bacteria

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

Quiz 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?

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