The Discovery of the Cell Robert Hooke cell The word ”____” was first used in late 1665 by Robert Hooke. He looked at thin slices of cork (plant cells) under the microscope.
Cork seemed to be made of thousands of tiny, empty chambers. Hooke called these chambers “cells” because they reminded him of the tiny rooms in which he lived in the monastery. Today we know that cells are not empty chambers, but contain much living matter.
Anton van Leeuwenhoek – late 1600’s Leeuwenhoek made many simple microscopes to observe things in nature that interested him. He discovered the hidden world of microorganisms in a drop of water. He called them “little beasties”. He was the first to: …. see and describe microorganisms under the microscope.
On the road to the cell theory…. Matthias Schleiden Theodore Schwann German Botanist 1838 German Zoologist 1839 Schwann said that all animals are made of cells. Schleiden said that all plants are made of cells.
Rudolph Virchow 1858 In 1858, Dr. Rudolph Virchow said that cells could only arise from preexisting cells.
The Cell Theory 1. All living things are composed of cells. 2. Cells are the basic units of structure and function in living things. New cells are produced from existing cells.
Most cells are too small to be seen with the naked eye. Cell Size Most cells are too small to be seen with the naked eye. Some cells such as the yolk of an egg are big. This is because the yolk doesn’t need to take in more nutrients If a cells volume gets too big, the cell’s surface area will not be able to take in enough nutrients, or get rid of wastes fast enough to keep the cell alive
Cell Size http://learn.genetics.utah.edu/content/cells/scale/
Cell Membrane, Cytoplasm, & DNA Common Cell Parts All cells have many different functions, and come in different shapes and sizes; however, all cells share the following parts: Cytoplasm (yellow) DNA Organelles
2 Types of Cells Cells can be categorized into two main groups: Cells with a nucleus, and cells without a nucleus Prokaryotic Eukaryotic No Nucleus Nucleus
Prokaryotes can be divided into two groups: Bacteria Archaea
EUKARYOTES Plant Animal Bacteria are the most common & smallest cells known. Plant Animal
Use pages 64-66 to complete the table (on your notes) Holt McDougal Online login: ecobb179 password: t5v9p