Cell Theory

Characteristics of Living Things There are 5 characteristics of living things: Living things respond to their environment Living things need energy Living things grow Living things reproduce Living things must get rid of waste See page 10 (c) McGraw Hill Ryerson 2007

Is a Virus a Living Thing?

Do Viruses.... Respond to their environment? Require energy? Reproduce?

What are viruses: Tim and Moby Brain Pop https://youtu.be/3N7bLHtuZ88

What is a virus? https://www.youtube.com/watch?v=7KXHwhTghWI

Characteristics of Viruses Do not contain other cell parts So DO NOT: Take in nutrients, use energy, produce waste Need a host to reproduce.

Wacky History of the Cell video https://youtu.be/4OpBylwH9DU

Discovery of Cells The invention of the microscope let scientists discover cells. Robert Hooke, a British scientist in the 17th century, created a microscope to observe tree bark. He called the structures “cells”.

Discovery of Cells Other scientists observed single-celled organism living in pond water. Their observations lead to “Cell Theory”

(c) McGraw Hill Ryerson 2007 Cell Theory 1. The cell is the basic unit of life. See pages 31-32 (c) McGraw Hill Ryerson 2007

Spontaneous Generation Theory https://www.youtube.com/watch?v=WzbHOY5fGqc Bill Nye https://www.youtube.com/watch?v=Dlbh6024R1c Mice came from dirty underwear https://www.youtube.com/watch?v=WNByRghR6sw

(c) McGraw Hill Ryerson 2007 Cell Theory 2. All cells come from other living cells. (c) McGraw Hill Ryerson 2007

(c) McGraw Hill Ryerson 2007 Cell Theory 3. All organisms are composed of one or more cells. See pages 31-32 (c) McGraw Hill Ryerson 2007

Largest Single-Celled Organism Ted Ed video https://ed.ted.com/lessons/what-is-the-biggest-single-celled- organism-murry-gans

Check your understanding Identify the statements that make up the cell theory. Give an example that supports each statement. What processes of scientific inquiry do you think scientists used to establish the cell theory?

Is a Virus a Living Thing? WB p11-13