Cellular Life

​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

Poll

Are viruses alive?

• YES

• NO

​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)​

Multiple Choice

Are you prokaryotic or eukaryotic?

• Prokaryotic

• Eukaryotic

​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

Open Ended

How did the invention of the microscope help us today?

Open Ended

If the microscope was not invented, how much do you think we will know about the Covid-19 virus?

Lab - Microscopy​

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