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? • 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” • 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? Where did the 1st ever cell come from? 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 • 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 • 2) Eukaryote: Cells with a nucleus & membrane bound organelles – More complex cells – Evolved from prokaryotes – Ex: Protists, Fungi, Plants, Animals Kobe Kuiz 1) 2) 3) 4) 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. 5) Which category of cells contain nuclei? 6) Why are bacteria considered the oldest forms of life on Earth? 7) How do prokaryotes and eukaryotes differ?