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Name______________________________ Period____ Date _________ Comparing Plant and Animal Cells Investigating Structure A cell’s structures affect how it responds to change in its environment. In this investigation, you will observe the differences between plant and animal cells. You will then make a slide of your own cheek cells. Materials forceps piece of onion scissors 4 glass slides Dropper pipette 4 cover slips Paper towel Microscope Prepared slide of animal cells Toothpicks Iodine Paper towels Procedure Part A: Plant and Animal Cell Structures 1) Using forceps, peel a thin layer from the inner surface of a piece of onion. 2) Use scissors to cut a small piece out of the layer you removed. 3) Place the piece of lettuce in the center of a glass slide. Add a drop of water to the piece of onion and cover it with a cover slip. 4) Examine your slide under the low-power objective of the microscope. In the space provided, sketch one cell and label any structures you recognize. 5) Carefully switch to high power and observe the cell again. Try to identify any cell structures, and add them to your sketch with appropriate labels. 6) Repeat steps 4 and 5 using prepared slides of animal cells. Use the space provided for your sketch. Onion Cells Low Power High Power Animal Cells Low Power High Power Part B: Cheek Cells 1) Clean your onion slide and get a toothpick from Ms. Humphrey’s desk. 2) Rub the toothpick in the center of a glass slide. 3) Raise your hand for Ms. Humphrey to come by and put a drop of iodine onto your slide. Place a cover slip onto the drop of iodine. 4) Examine the slide under the low-power objective of the microscope. In the space provided, sketch one cell and label any structures you recognize. 5) Carefully switch to high power and observe the cell again. Try to identify any cell structures, and add them to your sketch with appropriate labels. Cheek Cells Low Power High Power Part C. Clean Up 1) Carefully unplug your microscope and place it in the cart. 2) Using a paper towel, wipe both the slide and cover slip and place them in the correct containers. 3) Place the animal tissue slide in the appropriate containers. 4) Wipe down your lab area with a paper towel. Analyze and Conclude 1) Describe the general shape of the onion cells and the animal cells you observed in Part A. _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 2) What structures did you see in the onion and animal cells? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 3) What are their functions? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 4) How are plant and animal cells similar in structure? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 5) How are plant and animal cells different? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 6) Describe the general shape of the cheek cells. Were you able to see any structures? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 7) How could you tell your cheek cells were animal? Why? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ 8) Where the cells in the red unknown plant or animal? Why? _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________