HELP PLEASE WILL GIVE POINTS You will have the option to complete this lab through hands-on or video observation formats. Regardless of the method you choose, you will form a hypothesis and record your data and observations.

Eggs are a great example of a cell. Underneath the hard shell is a thin membrane that is just like the cell membranes in other cells. Remember that the function of the cell membrane is to control the internal balance of the cell. It helps to maintain homeostasis.

View the instructions and lab report for your chosen activity:

lab report
video observation lab
After you complete your chosen activity, you will complete a laboratory report. You will use the following rubric to guide your work.

THE VIDEO
“Welcome to the Cellular Transportation Lab. Please make you have opened and read all of the instructions on the lab report before beginning. If you need time to do this, please pause the presentation.”

Short pause

“In this lab, you will see the transportation of water through a cell. We call this osmosis. An egg is a great example of a cell. Underneath the hard shell is a thin membrane that is just like the cell membrane of your cells. There are microscopic pores in the membrane that allow substances to move in and out of the cell. If you remember, the cell membrane controls materials in and out of cells. This maintains homeostasis, which is the balance between conditions inside and outside the cell. We’ll measure how cells are affected by the movement of water.”

Short pause

“In this lab, the materials that were used were a raw egg, yarn, a metric ruler, white vinegar, tap water, and a jar with a lid.”

Short pause

“The summary of the procedures are as follows: The egg was placed in vinegar, where it dissolved the shell within the first 24 hours. The egg was then placed in water for two days, or 48 hours. Each day, two observations and the circumference of the egg was taken at four different points. It was taken at the zero point, the 24-hour mark, the 48-hour mark, and the 72-hour mark after starting the experiment. Each day, the yarn and the ruler were used to measure the circumference of the egg in centimeters.”

Short pause

“Okay let’s pause for a moment. Have you recorded your hypothesis on your lab report yet? What do you anticipate will happen to the size of the egg as you observe osmosis through the cell membrane? If you have not recorded your hypothesis yet, please pause the presentation. Record your hypothesis, review your procedures, and get ready to start recording your data.”

Short pause

“Let’s continue with the experiment. Here is a picture of the egg on the first day at the zero-hour mark. You can see that yarn was used to measure the circumference of the hard outer shell. Take a moment to pause the presentation, and on your data table record two visual observations along with your data that was collected on the circumference of the yarn. You can use the ruler provided to measure this distance.”

Short pause

“Continuing on with the experiment and fast forwarding through time. You can see in the second picture the egg has now sat in vinegar for 24 hours. The shell is dissolved, and new circumference measurements were taken.”

“What do you anticipate the egg would feel like with no shell?”

“What do you think would happen to the size of the egg after 24 hours?”

“You can notice the visual differences in the appearance of the egg. Pause the presentation, record two observations using the picture, and again in your data table, record the distance of the circumference using the ruler provided.”

Short pause

“We are currently at the 48-hour mark with our lab experiment. At 48 hours, the egg has now been soaking in a jar of water for 24 hours.”

“What do you anticipate the egg would feel like at this point? What visual observations can you make of the egg in the jar?”

“At 48 hours, the circumference of the egg was taken. You can see on the presentation the length of the yarn. Use the ruler provided to collect your data. Pause the presentation and record two observations of your data on your data table.”

Short pause

“We are now at the 72-hour mark. The egg has been soaking in water for the last two days. The membrane is starting to look transparent.”

“What other observations can you make about the egg?”

“At 72 hours the circumference of the egg was taken. The length of the yarn and a ruler are provided for you to record your data. Take a minute and record two observations of your data in your data table.”

Short pause

“At this point you should have completed your lab report. Make sure that you have completed your hypothesis, that you have a data table that includes all of the measurements and observations and answered your conclusion questions. I hope this lab activity was an experience you enjoyed.”