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Copy of Cell Transport Lab

Lesson 02.02 Early Cells
by

Joshua Mercado

on 29 September 2013

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Transcript of Copy of Cell Transport Lab

Cell Transport Lab Instructions
Early Cells
Materials
raw egg
string or thread or yarn
ruler
white vinegar
tap water
jar with a lid
Biology
Joshua A. Mercado
The egg experiment.
I put a raw egg in a glass jar.
I filled up the jar with vinegar.
Lots of bubbles covered the egg.
After an hour the egg lifted off the bottom and was suspended.
In the afternoon it floated on the top.
At the end of the afternoon it sank to the bottom.
It smelled gross like vinegar.
It got many cracks in the shell. The bubbles on top looked more like foam. When we emptied out the vinegar we noticed something interesting. The egg did not make a noise when we slid it up against the glass. It bounced off the side and was quiet.the egg was soft and slimy.
Today I took the egg out of the jar. It was very rubbery. I could see through it when I held it up to the light. There was a white swirly pattern on the membrane. You could see the shadow through the egg. I got another egg to compare it too. And it was a lot bigger than it.
Ps: do not smell the project, it will burn your nose.
4.Consider how lettuce or spinach placed in water becomes firm and crisp. Use what you have learned about cell membranes to explain this observation.
3. Evaluate the lab and data collected. Would you conclude that the lab represented active transport or passive transport? Explain your answer.
The growth in the size of the egg was caused because the water transported across the egg membrane (osmosis). It could not have been an active transport because the egg was not alive and could not have been expending energy to move the water in!
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Conclusion:
1. How much did the egg change in size? (answer should be in centimeter)
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2. Was your hypothesis correct? Why or why not
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5. If you were to continue this experiment by removing the egg from the water and covering it in syrup, what do you think would happen. Explain your prediction. (If you choose to test your prediction, be sure to allow at least 24 hours before making your observations. And, of course, handle the egg very carefully!)


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Before beginning the experiment, record at least two observations of the raw egg in your lab report.
Wrap the string around the center of the egg to determine its initial circumference. Measure the string and record the initial circumference in centimeters (cm).
Gently place the egg in the jar and completely cover the egg with vinegar. Use the lid to seal the jar and note the time. This will be considered the "start time" of the experiment.
After approximately 24 hours from the start time, carefully remove the egg from the jar of vinegar. If the shell has completely dissolved, exposing the inner membrane, move on to the next step. If not, return the egg to the vinegar until the shell has completely dissolved.
Record at least two observations of the egg.
Measure and record the circumference of the egg, being sure to measure it in the same way every time you measure circumference.
Pour out the vinegar and rinse the jar. Then fill the jar about half full of tap water.
Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar.
After a total of 48 hours from the start time, carefully remove the egg from the jar of water.
Make two observations of the raw egg, and measure and record the circumference.
Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar.
After a total of 72 hours from the start time, carefully remove the egg from the jar of water.
Make two observations of the raw egg, and measure and record the circumference.

1.Wash your hands carefully after each time you touch the egg.
2.Be sure that you have permission and supervision from a guardian before completing this lab activity.
3.The egg and vinegar are safe for kitchen drains, but check with a guardian for the preferred method of disposal in your kitchen.
Safety Notes
Step by Step
My hypothesis was that the egg would get bigger and stink from the vinegar. I have to say that's exactly what happened, though something I didn't think of was what the structure of it would be like. It was rubbery after taking it out of the jar. It was gross.. other than that I say my hypothesis was spot on!
If I continued to do this experiment by removing the egg from the water and covering it in syrup, the syrup would just slide off the egg. I think the syrup would slide of the egg because the rubbery structure would make the syrup just slide off.
The lettece or spniach placed in water becomes firm because of the cell membranes structure.
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