​Objectives

1. ​I can summarize the modern cell theory

2. ​I can identify important scientists that contributed to the modern cell theory

3. ​I can compare and contrast archaea, bacteria, and eukaryote cells

4. ​I can use a microscope properly

Cellular Life

Module 3, Lesson 1

​Spontaneous Generation

​- Before the cell theory was developed, people thought living things just appear out of nowhere.

​- This is what they called spontaneous generation

​- They even had recipes on how to make living organisms

Development of the Cell Theory

Robert Hooke

​- observed a cork under a simple microscope

​- discovered that the cork is made up of small pores.

​- He called these pores "cell"

​Cell

​A cell is the smallest functional unit of life.

Development of the Cell Theory

Matthias Schleiden

• ​discovered the plants are composed of cells

Development of the Cell Theory

Theodor Schwann

• stated that animal tissues are made up of different cells

Development of the Cell Theory

Rudolf Virchow

• Proposed that cells are produced only by the division of already-existing cells

• ​idea was reported to be plagiarized and stolen from another scientist, Robert Remak

​The Cell Theory

1. ​All living things are made up of cells.

2. ​Cells are the basic units of structure and function in living things.

3. ​Living cells come only from other living cells

​Types of Cells

• ​Depending on the organism, the type of cell they have may differ.

• ​All cells have:

  • ​DNA

  • ​ribosomes

  • ​cytoplasm

  • ​cell membrane

​Prokaryote Cell

• ​single-celled organisms

• ​cells are usually much smaller than eukaryotic cells

• ​most abundant life form (Archaea and Bacteria)

• ​they lack nucleus

• ​their DNA is circular

• ​do not have organelles

​Eukaryotic Cell

• ​multicellular and unicellular organisms

• ​larger than prokaryotic cell

• less abundant in number​

• has nucleus

• has organelles (membrane-bound structures)​

​Technology to Visualize Cells

• ​Anton Van Leeuwenhoek

  • ​Considered to be the father of microscopy

​Types of Microscopes

• ​Light Microscope

  • ​light passes through the specimen

  • ​specimen must be thin enough for light to pass through it

​Types of Microscopes

• ​Scanning electron microscope (SEM)

  • ​specimen must be dry and not alive

  • ​takes a 3D image of the surface

​Types of Microscopes

• ​Transmission electron microscope (TEM)

  • ​thin slices of specimen

  • ​electron goes through the specimen

Lab - Microscopy​

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