2.04 cell transport lab report biology

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Florida Virtual School *

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8111033

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Chemistry

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Jun 1, 2024

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Cell Transport Lab Report Instructions: There are two options for completing the lab. You can either complete the lab at home over the course of three days or watch the teacher-led video and record your observations. Links to the hands-on lab and video observation lab are on the assessment page. Title: Cell Transportation Lab Report Objective(s): to measure and analyze cell transportation and do so by leaving an egg in vinegar. Hypothesis: I believe the egg will be enlarged when left in vinegar and water because the egg will absorb the water causing it to enlarge due to the process of osmosis. Variables:  Independent Variable: water and vinegar  Dependent Variable: the egg  Controlled Variable: the cup or jar Materials:  Raw egg  String or thread or yarn  Ruler  White vinegar  Tap water  Jar with lid (like a mayonnaise jar or something big enough to put the egg in) Procedure: 1. Before beginning the experiment, record at least two observations of the raw egg in your lab report. 2. 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). 3. Gently wrap 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. 4. 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. 5. Record at least two observations of the egg. 6. Measure and record the circumference of the egg, being sure to measure it in the same way every time you measure circumference. Unless Otherwise Noted All Content © 2023 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.

7. Pour out the vinegar and rinse the jar. Then fill the jar about half full of tap water. 8. Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar. 9. After a total of 48 hours from the start time, carefully remove the egg from the jar of water. 10. Make two observations of the raw egg, and measure and record the circumference. 11. Gently place the egg back into the jar, making sure it is completely covered with water. Use the lid to seal the jar. 12. After a total of 72 hours from the start time, carefully remove the egg from the jar of water. 13. Make two observations of the raw egg, and measure and record the circumference. Data and Observations: Record your observations from the experiment either the hands-on lab or the teacher led video. Don’t forget to include at least two detailed observations and the measurement of the egg’s circumference in centimeters. Time (hours) Observations Circumference (cm) 0 1. Hard shell 2. smooth surface 16 cm 24 1. lighter color 2. flakey shell 17.5 48 1. squishy 2. small bit of transparent 18 72 1. whiter tint 2. more transparent 18.5 Conclusion: Unless Otherwise Noted All Content © 2023 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.

Include the following as a summary paragraph in the conclusion of your lab report:  Analysis of the results of the experiment o How much did the egg change in size? (answer should be in centimeter) roughly .5 cm each 24 hours. o What type of transport occurred in this lab? Explain your answer. osmosis  Rationale for the support or rejection of the hypothesis my hypothesis was correct or supported the data  Description of how the investigation could be tested further we could try seeing how long it would take to dissolve the egg completely or maybe even what would happen if the egg was left cracked open in the vinegar. There are so many different and creative ways to further test the experiment. Questions: Using what you have learned in the lesson and the experiment, answer the following questions in complete sentences. 1. Consider how lettuce or spinach placed in water becomes firm and crisp. Use what you have learned about cell membranes to explain this observation. Be sure to include homeostasis in your explanation. The lettuce or spinach becomes firm and crisp because of the process of osmosis where water moves through the greens like how it moves through the egg. The reason this relates to homeostasis is because from what I learned and as far as I know it is a steady balance of conditions inside of a system. 2. If you were to continue this experiment by removing the egg from the water and covering it in corn syrup (a hypertonic solution), 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!) I think something very different would happen compared to what happened in the previous experiment we concluded. I believe this because the water would want to mix with the syrup and it would make a protective barrier around the eggshell… is what I think. 3. Equilibrium is when the concentration is the same throughout and entire system. Explain how a cell reaches equilibrium in all three types of solutions (hypertonic, hypotonic and isotonic). Hypertonic would lose water until equilibrium is reached. Hypotonic would gain from the surroundings until there wasn’t any more movement of water. Isotonic will not gain OR lose water because the surrounding solutions have equal solute concentrations. Unless Otherwise Noted All Content © 2023 Florida Virtual School. FlexPoint Education Cloud™ is a trademark of Florida Virtual School.

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