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Copy of The Discovery of Cells

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Nicole Sheppard

on 20 October 2015

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Transcript of Copy of The Discovery of Cells

Cell Theory
The Discovery of Cells
(cc) photo by jimmyharris on Flickr
(cc) photo by Metro Centric on Flickr
Robert Hooke observed cork under a microscope and called the tiny structures "cells" because they looked like the cells that monks lived in.
Who was the first person to observe cells under a microscope?
Why do you think he called the little structures cells?

The cells of plants and fungi have cell walls.

Hooke didn't think animals cells were made of cells because he couldn't see their cells under a microscope.
Hans and Zacharias Janssen were dutch lens grinders who were credited with inventing the first compound microscope.
They made a compound microscope by placing two lenses in a tube.
Anton Van Leeuwenhoek was the first person to view micro-organisms under a microscope.
What is Leeuwenhoek credited for discovering?
The Cell Theory
He looked at pond scum and coined the term "Animalcules". Today we call them "protists"

He was the first to see bacteria and he discovered that yeast are single-celled organisms.
1. All organisms are made up of one or more cells.
2. The cell is the basic unit of all living things.
3. All cells come from existing cells.
It would take 50 human cells to cover the dot on the letter "i" in your textbook.
Cell sizes
Egg yolk cell
1. All living organisms are composed of one or more cells.
2. Cells are the basic unit of structure and organization for all living things.
3. Cells arise only from pre-existing cells, with cells passing copies of their genetic material to their daughter cells.
Parts of a Cell
1. Cell membrane
Two types of cells
2. organelles
3. DNA
Prokaryotes: don't have a nucleus

Eukaryotes: have a nucleus
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