Cheek_Cell Theory.notebook
December 06, 2013
December 5­6, 2013
1. Record your homework.
2. Place all of your other belongings in a cubbie. Have your science binder on your desk. Question of the Day: On the next page...
Recall:
Organism­­any independently living thing­­plant, animal or other life­form.
An organism is always free­living (independent) which means it is NOT a part of a larger living organism.
• Can a single living cell be an organism? When?
• Can a single living cell NOT be an organism? When?
• Is an Elodea leaf cell an organism? Why?
• Is a paramecium cell an organism? Why?
Cheek_Cell Theory.notebook
December 06, 2013
The Elodea plant is an organism made of many cells.
It is a multicellular organism. The paramecium is an organism that is just one cell. It is a single­celled organism. Cheek_Cell Theory.notebook
December 06, 2013
Paramecium are single­celled organisms in a kingdom of life called Protista. In Greek, proto means early, and protist means the very first. So single­celled organisms like paramecia are members of a kingdom of life that includes organisms that are similar to some of the very first life­forms on Earth.
Keep in mind, protists are NOT animals. Animals are ALWAYS multicelluar.
Protista is a separate kingdom whose members are mostly single­celled.
Complete the venn diagram.
Single­Celled
Organism
Made of one cell
Paramecium
Can live on its own as a single cell
Multicellular
Organism
Performs all the functions needed to stay alive
Made of many cells
Elodea
Can live on its own only if it has many cells
Cheek_Cell Theory.notebook
December 06, 2013
We have come up to an important point in our investigation of life. We have been developing a definition of "living" by describing the nine characteristics of life. These characteristics of life are also the characteristics of cells. Cells are alive. Life happens in cells and only in cells. Cells are the fundamental units of life. Some cells, like paramecium, live alone. Some cells, like Elodea leaf cells, live with millions of others. Both are alive, and both do all the things that we recognize as living.
But NOT all cells are organisms, because not all cells are able to live independently.
Content Enhancement 3.3
Word Bank
Fill in the Blank
Cells are ______.
Life happens in _____ and only in cells.
The _____ is the basic unit of _____.
Every _____ performs all of the
________ needed to stay alive.
All _________ are either cells living
________ (single-celled organisms)
or _______ of cells living ________
(multicellular organisms).
cells
cell
alive
life
functions
cell
together
organisms
alone
masses
Cheek_Cell Theory.notebook
December 06, 2013
Content Enhancement 3.3
Fill in the Blank
Word Bank
alive
Cells are ______.
cells and only in cells.
Life happens in _____
cell is the basic unit of _____.
The _____
life
cell performs all of the
Every _____
functions needed to stay alive.
________
organisms are either cells living
All _________
alone (single-celled organisms)
________
masses of cells living ________
or _______
together
(multicellular organisms).
Complete the Microscopic Life Response Sheet
• Answer the question(s) that is being asked.
• Answer ALL parts of the question.
• Include details and or examples to help explain your answer.
Cheek_Cell Theory.notebook
December 06, 2013
Elodea/Paramecium Response Sheet
The second student is correct. All cells are living, but not all cells are organisms. Organisms are independently living things meaning they can live on their own.
Paramecia are individual, independent cells. So the paramecia are organisms.
Elodea cells DO NOT live independently. So they are NOT organisms.
Single­Celled­­ Organism made up of one cell
Multicellular­­Organisms made up of more than one cell
The cells of single­celled organisms are organisms because they are independent living things.
The cells of multicellular organisms are not organisms because the cells do not live independently.
Cheek_Cell Theory.notebook
December 06, 2013
Cheek Investigation
What are humans made of?
What evidence do you have that humans are made of cells?
There is one easy way to investigate a sample of human tissue: cheek scraping.
We will scrape the inside of our mouths (cheeks) and look at it under the microscope.
Cheek Investigation
1. Use flat end of toothpick to gently rub the inside of your cheek five or six times.
2. I will put a drop of blue dye on your slide.
3. Stir toothpick in drop of dye for one minute.
4. Add 4 drops of water and stir again.
5. Place a coverslip on the slide. Use paper towel to absorb the liquid from the edge of the coverslip.
Cheek_Cell Theory.notebook
December 06, 2013