Day 1: Cells

Write each of the words below on your new do first sheet Write each of the words below on your new do first sheet. Then write “alive” or “not alive.” You do not need complete sentences. Plant air wind animals bacteria viruses protists rocks fungi soil fire water

Are these things alive? Plant air wind animals bacteria viruses protists rocks fungi soil fire water Living Living Living Living Living

Notes: Living vs. Non-Living

Ex. of Life and Nonlife: Living Things: plants, animals, protists, fungi, bacteria Nonliving Things: viruses, fire, rocks, soil, air, water, sunlight This is a picture of Mycobacterium tuberculosis a bacteria which causes the disease tuberculosis. What happens when you get this disease?

I. KEY CONCEPT Cells are the basic unit of life. They are the smallest unit able to perform the basic functions of life. (Basically the SMALLEST LIVING THINGS)

7 Characteristics of Living Things Movement Growth & Development Sensitivity Reproduction Use of Energy Made of Cells Eliminate Waste

Notes: Cell Theory & Microscopes

Who was involved? (Two of these dudes are our scientists of the week!) The cell theory grew from the work and research of many scientists.

What did they use? (It’s all about the technology!) More was learned about cells as microscopes improved over the years

History of Cells and Microscopes In the 1600’s compound light microscopes were invented. These microscopes use a series of lenses to magnify objects. (Magnify means to make objects look bigger.) After the invention of the microscope, scientists began to look at cells under the microscope.

Microscopes Compound light microscope used today. Original Microscope from 1600’s Compound light microscope used today.

Robert Hooke Used light microscopes to look at plant tissue Noticed that a piece of dead cork had tiny chambers Called them cells because they looked like the cells of a monastery Hooke's Microscope  Hooke's drawing of Cork Cells

Anton van Leeuwenhoek (LAY-vuhn-hook) One of first people to use a microscope to study living things from nature Able to see things that no one had seen before First person to see the tiny organisms living in pond water

Growth Mindset Quote of the Week "Whenever I found out anything remarkable, I have thought it my duty to put down my discovery on paper, so that all ingenious people might be informed thereof." Antonie van Leeuwenhoek

Principal # 1 All organisms are made of one or more cells. Some organisms are made up of one cell Others are multicellular or made up of many cells

Principal # 2 The cell is the most basic unit of life.

Principal # 3 All existing cells are produced by other living cells.

These scientists’ studies led to the development of the cell theory! A theory is a well tested hypothesis that can explain a broad range of observations The cell theory applies to all living things BIG and small and has three main principals Cells can provide a lot of information about living things

The Wacky History of Cell Theory https://www.youtube.com/watch?v=4OpBylwH9DU

Other important Scientists C. Matthias Schleiden (SHLY-dun) All plants are made of cells D. Theodor Schwann All animals are made of cells E. Rudolf Virchow Looked at how cells reproduce Cells come from cells that already exist

History of Cells and Microscopes -In the 1930’s electron light microscopes were invented which allowed scientists to look at even smaller objects, such as organelles.

II. Cell Theory Summary -In the 1830’s something called the “Cell Theory” became a popular way of describing life in terms of cells. -The cell theory is made up of three main ideas: 1. All organisms are composed of one or more cells. An organism may be made up of one cell, such as bacteria, or may be multicellular, that is have many cells, such as plants and animals. 2. The cell is the basic unit of structure and organization or organisms. Although organisms such as humans, dogs and trees can become very large and complex, the cell remains the simplest, most basic part of an organism. 3. All cells come from preexisting cells. This means that a cell comes from a parent cell (one parent cell divides to become two daughter cells).