Warm Up Get your notebook. Grab a notecard from the front. Put your name on it. Answer the following questions:

1. Looking in your notes, what is the scientific definition for work?

NOT THE FORMULA!!!!

2. Which ramp would require the least amount of work?

A.

B.

Cell Theory•All living things are made of cells.•Cells are the basic units of structure and function in all living things. (structure = form; function = purpose)•Cells come from pre-existing cells.

Aristotle 334 B.C.E. Observed nature directly. He classified all known organisms as either plants or animals.

B.C.E.= Before Common Era

Hans & Zacharias Janssen 1595 Produced the first compound microscope by lining up 2 lenses.

Robert Hooke 1665 Observed living matter from a piece of cork through a compound microscope, which reveals empty cells.

He is the first to call the spaces in the cork “cells” which means little rooms.

Anton van Leeuwenhoek 1675 Observed living cells through a simple microscope.

Matthias Schleiden

1838 Discovered that plants were made of cells.

Theodor Schwann 1839 States “all animals are made of cells.”

William Henry Perkin 1856 Develops an intense purple dye, which is used to stain slides.

Rudolph Virchow•1858

•Rudolph Virchow states…“Where a cell exists, there must have been a preexisting cell.”

Create a Cell Timeline

Label the timeline with the dates, scientist names, and details of the important discoveries.

The earliest date should be on the left and the most recent on the right.

8 events & 8 pictures Graded on neatness, accuracy, and use of color. List Cell Theory and the 3 parts of the Cell Theory.