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Transcript
Back Print Name Date Class L AB 2 STUDENT WORKSHEET The Incredible Edible Cell • various food items of your choosing • box of gelatin • several rolls of plastic food wrap (for the cell membrane) • transparent mold for gelatin, such as a heat-resistant bowl or baking dish • 1 L of hot water • stirring spoon • refrigerator Objective To make an edible model of the cell Getting Ready 1. Your teacher will assign your group a plant or animal cell to model. As a group, determine how you will go about creating your model by asking questions such as the following: • How do plant and animal cells differ? • What organelles are present in our cell? • What is the structure and function of each organelle in our cell? Copyright © by Holt, Rinehart and Winston. All rights reserved. • What foods will we use to represent the organelles and other components of our cell? • Do our chosen foods accurately represent the structure of each organelle? 2. As a group, develop a blueprint of your cell model. Be sure to label each part of the cell and to write an explanation for your choices of foods. Be prepared to justify your choices for each organelle. Include a key at the bottom of your blueprint for reference. 3. Make a checklist of the food items and materials you will need in order to build your model cell. Each member of your group should be assigned one or more of these items to bring to class on the day of the activity. 4. Agree upon a place for gathering your food items and materials so that you have everything you need to make your edible cell. LABS YOU CAN EAT 7 ▼ ▼ ▼ MATERIALS LIFE SCIENCE What do all these items have in common: spreadsheets, monasteries, batteries, armadillos, plants, and humans? Answer: they all contain cells. However, only armadillos, plants, and humans contain living cells. Inside all living cells are tiny structures called organelles—little organs—which help the cell function just like your organs help your body function. Over the next few days, you will be part of a group that will create an edible model of a living cell. In doing so, you will gain a better understanding of the various parts of a cell that help it function. Back Print Name Date Class The Incredible Edible Cell, continued Day 1: Building a Larger-than-LifeSized Model 5. Collect the materials your group has brought for your cell model, including all edible and nonedible items. Consult your checklist to make sure you have everything you will need. You are now ready to build! 6. The gelatin mold represents the cell wall (this may or may not be part of your model). Place a sheet of plastic wrap in the mold. This represents the cell membrane. Carefully pour the gelatin and hot water into the mold until the mold is about 75 percent full. The gelatin represents the cytoplasm, the liquid internal environment of a cell. 7. Add the foods you have chosen to represent the organelles into the gelatin, and stir the mixture. 8. Cover the completed mold with plastic wrap, and refrigerate it overnight so that your cell model will set. Sample Animal Cell 9. Remove your mold from the refrigerator, and study the structure of your model. As a group, make a key to identify the organelles in your model. A sample key is provided at left. 10. If you made an animal-cell model, trade your model with another group for a plant-cell model. If you made a plant-cell model, trade it for an animal-cell model. A B C D E F G KEY A. B. C. D. E. F. G. H. 8 cell membrane—plastic wrap nucleus—plum ribosome—candy sprinkles endoplasmic reticulum—gummy worms mitochondria—raisins centriole—rope licorice golgi complex—fruit strips lysosome—empty vitamin capsule HOLT SCIENCE AND TECHNOLOGY H 11. Designate one member of the group to be the illustrator. With group input, the illustrator should draw a sketch of the other group’s cell model. The illustrator should label the sketch, identifying all structures in the cell. 12. When you are finished, trade cells with the other group and compare your sketch with theirs. 13. Answer the questions on the next page individually. Copyright © by Holt, Rinehart and Winston. All rights reserved. Day 2: All Cells Are Not Alike Back Print Name Date Class The Incredible Edible Cell, continued Analysis 14. How were the structures in the cell your group created similar to the structures in the cell you received from the other group? Sample answer: Both cells contained an endoplasmic reticulum, a 15. How did the cell structures differ? Sample answer: Our cell was a plant cell, but the other group’s cell was an animal cell. Our cell contained chloroplasts, vacuoles, and a cell wall, but theirs did not. Their cell contained lysosomes and centrioles, but ours did not. Critical Thinking 16. Explain any differences in the contents of a plant cell and an animal cell in terms of the function of the cell. Copyright © by Holt, Rinehart and Winston. All rights reserved. Answer to Going Further: Encourage students to be creative when developing their blueprints. Nerve cells and red blood cells exhibit structural features that are different from the animal and plant cells modeled in this activity. For example, nerve cells have dendrites and axons while red blood cells lack a nucleus or mitochondria. The human body is made up of over 100 different types of cells. Animal cells don’t contain chloroplasts because they don’t make their own food through photosynthesis. Animal cells don’t contain vacuoles because they don’t need a location to store water and keep their shape the way plants do. Animal cells don’t have cell walls because they have to be able to move. Plant cells do not need lysosomes to function. Instead, plants use their vacuoles as giant lysosomes. Going Further Research a specialized cell, such as a nerve cell or a red blood cell. Then develop a blueprint for an edible model of that cell using edible items. In doing so, consider how the structures in the specialized cell differ from the structures in a typical animal or plant cell. LABS YOU CAN EAT 9 ▼ ▼ ▼ nucleus. LIFE SCIENCE Golgi complex, ribosomes, a cell membrane, mitochondria, and a