Observing our cells lab
Purpose Students will be comparing and contrasting plant and animal cells (onion and cheek) by drawing each and labeling their parts.
Materials
1. microscope
2. slides
3. cover slips
4. stain; methylene blue or iodine
5. toothpicks, flat
6. onion
Procedure Animal cells
1. The animal cells we will use comes from you, specifically, the inside of your cheek. We lose skin cells all the time, so we'll take a few from the inside of our cheek. Take the toothpick and scrape the inside of our cheek about 20 times.
2. Smear this in the middle of a glass slide. Put one drop of stain on it and cover it with a cover slip. Congratulations, you've successfully mounted a wet slide.
3. Put the slide on the stage of the microscope under the clips and over the hole of the stage.
4. First find the cells and focus on them using the scanning objective.
5. Once they are visiable switch to low power. Draw what you see in your lab book. The cells look like pieces of a broken plate.
6. Switch to high power
7. When you locate the cheek cells, draw what you see labeling cell walls, cytoplasm, and the nucleus of one cell. Be sure to label your drawing with the magnification
Plant cells
1. Hopefully, now that we are microscope experts, let's learn how to mount a wet slide containing onion cells.
a. take a small chunk of an onion, and from the concave side, peel off a small piece of the onion skin. This skin is only a cell-width thick.
b. Place this piece of onion skin in the middle of the glass slide as smooth as possible.
c. Carefully, put one drop of stain on your specimen. Cover the specimen with a cover slip.
2. Put the slide on the stage of the microscope under the clips and over the hole of the stage.
3. Focus on the onion cell using scanning power before you switch to low power. Draw what you see under low power
4. Switch to high power
5. Draw all of what you see labeling cell wall, cytoplasm, and nucleus of one of the cells. Be sure to label your drawing with the magnification
Analysis – compare the plant and animal cells.
Purpose Students will be comparing and contrasting plant and animal cells (onion and cheek) by drawing each and labeling their parts.
Materials
1. microscope
2. slides
3. cover slips
4. stain; methylene blue or iodine
5. toothpicks, flat
6. onion
Procedure Animal cells
1. The animal cells we will use comes from you, specifically, the inside of your cheek. We lose skin cells all the time, so we'll take a few from the inside of our cheek. Take the toothpick and scrape the inside of our cheek about 20 times.
2. Smear this in the middle of a glass slide. Put one drop of stain on it and cover it with a cover slip. Congratulations, you've successfully mounted a wet slide.
3. Put the slide on the stage of the microscope under the clips and over the hole of the stage.
4. First find the cells and focus on them using the scanning objective.
5. Once they are visiable switch to low power. Draw what you see in your lab book. The cells look like pieces of a broken plate.
6. Switch to high power
7. When you locate the cheek cells, draw what you see labeling cell walls, cytoplasm, and the nucleus of one cell. Be sure to label your drawing with the magnification
Plant cells
1. Hopefully, now that we are microscope experts, let's learn how to mount a wet slide containing onion cells.
a. take a small chunk of an onion, and from the concave side, peel off a small piece of the onion skin. This skin is only a cell-width thick.
b. Place this piece of onion skin in the middle of the glass slide as smooth as possible.
c. Carefully, put one drop of stain on your specimen. Cover the specimen with a cover slip.
2. Put the slide on the stage of the microscope under the clips and over the hole of the stage.
3. Focus on the onion cell using scanning power before you switch to low power. Draw what you see under low power
4. Switch to high power
5. Draw all of what you see labeling cell wall, cytoplasm, and nucleus of one of the cells. Be sure to label your drawing with the magnification
Analysis – compare the plant and animal cells.
We just started working on a major project - Due Dates are below
Tuesday September 24 the iconic picture for their cell is due
- ICONIC PICTURE: You will need to generate a unique iconic picture or representation of your cell organelle/structure for use in campaign posters. This can be composed by hand or with a computer program, but it must be original artwork. Use the submission page included in this packet when you turn in the final draft. Iconic picture must be submitted on Tuesday
Wednesday September 25th the campaign poster
- CAMPAIGN POSTER: The group will need to put up at least 1 campaign poster championing the greatness of the cell organelle/structure you are supporting and include your iconic picture and a slogan. Posters must be up by Wednesday. One smaller flyer or poster should be ready to put up in the display case; the other(s) can go outside of the science room
Thursday September 26th the Information Pamphlet is due
- You will need to create a campaign pamphlet that describes the amazing candidate your cell organelle/structure is for the position of “Cellular Executive”. The iconic picture should be on the front with the slogan. On the inside, the pamphlet should include details about the cell organelle/structure, diagrams, and functions that make it so important. Why is it important for survival? Is it linked to the survival of an ecosystem? The world? Campaigns are dramatic, go with it. Include citations on the back of the pamphlet (MLA). You might also include testimonials, quotes from doctors or experts, be creative. Pamphlets are due Thursday.
Tuesday October 1 is speech/election day
You will create a speech/ad that is 2 to 3 minutes in length to Convince your voters, based on structure and function, that your organelle/structure is the best candidate/most important cell part. You must deflect the smear campaigns against your organelle/structure and include some mudslinging in the direction of each of your opponents. The speech will be given to the opposite class and they will vote based on the speeches and campaign literature. A transcript of the speech is due on Monday September 30 Speeches will be Tuesday October 1st: Campaign Day
A cell - is the basic unit of structure and function in living things.
Invention of microscope made seeing cells possible
Robert Hooke discovered cells by looking at cork - he thought they looked like “prison cells”
Anton van Leeuwenhoek - This Dutch scientist discovered little things swimming in pond water which he called “animalcules” (little animals) with microscopes he made himself
Matthias Schleiden discovered that all plants were made of cells in 1835
Theodore Schwann discovered that all animals were made of cells in 1836
Rudy Virchow discovered that all cells come from other cells in 1855; His rule - Omnis cellula e cellula ("every cell originates from another cell")
Three main parts to the cell theory
1. All living things are made of cells
2. All cells come from other cells
3. The cell is the basic unit of structure and function in living things
Invention of microscope made seeing cells possible
Robert Hooke discovered cells by looking at cork - he thought they looked like “prison cells”
Anton van Leeuwenhoek - This Dutch scientist discovered little things swimming in pond water which he called “animalcules” (little animals) with microscopes he made himself
Matthias Schleiden discovered that all plants were made of cells in 1835
Theodore Schwann discovered that all animals were made of cells in 1836
Rudy Virchow discovered that all cells come from other cells in 1855; His rule - Omnis cellula e cellula ("every cell originates from another cell")
Three main parts to the cell theory
1. All living things are made of cells
2. All cells come from other cells
3. The cell is the basic unit of structure and function in living things
what_is_a_cell.ppt | |
File Size: | 685 kb |
File Type: | ppt |