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Biology Cell Lab

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Introduction

Biology Cell Lab Design Question What are the differences between the structures and sizes of plant and animal cells? Materials Microscope Slide Cover slip Water Elodea Human Wooden stick Methylene blue Procedure The microscope was set up and the elodea leaf was picked off using tweezers and placed on a slide. A drop of water was added to the slide and a glass cover was dropped at a 45 degrees angle. The slide was examined under the microscope starting at the low objective lens then the medium objective lens and lastly the high power objective lens. The diagram of the elodea was drawn and the measurements were written down. Next, the human cheek cell slide was prepared. A drop of water was added to the slide and saliva scraped from the side of the cheek using a wooden stick was dabbed onto the drop of water. Then a drop of methylene blue was added to the mixture and a slipcover was placed on top of the specimen. ...read more.

Middle

Plants are usually in a rectangular shape surrounded by a cell wall that helps them stay in a rectangular shape. Animal cells are usually in a round oval shape and have no cell wall. Plants cells contain many chloroplasts that conduct photosynthesis while animal cells do not have those because animals do not make food through photosynthesis. Also Plant cells have a much bigger vacuole to contain water and waste while animal cells have a smaller one. Plant cells are also generally larger in size than animal cells. Limitations of Experimental Design In this experiment my experimental design did help answer my experimental question. Looking at the cells' main structures worked well because those were displayed very clearly through the microscope including the cell walls, cell membrane, the nucleus and chloroplasts. However, examining the cell's smaller structures and finding the elodea cells' nucleus did not work very well because those were not visible through the microscope. ...read more.

Conclusion

70 52.5 21 26.3 52.5 42 26.3 30 105 35 35 35 70 52.5 42 35 105 42 30 30 Mean = 80.5 Mean = 44.8 Mean= 30.9 Mean =31.3 This table shows that plant cells are larger than animal cells c) Compare the Elodea cells to the tomato cells. Explain why the cells of the tomato do not appear to have any chloroplasts Elodea cells are similar to tomato cells however, Elodea cells are rectangular in shape and tomato cells are circular. Tomato cells do not appear to have any chloroplasts because it is a fruit plant and therefore does not carry on photosynthesis like the Elodea cell. However, tomatoes have chromoplasts that give them the colour red. d) What structure did methylene blue stain in the animal tissue The Methylene blue stain stained the cell membrane, the nucleus and some unidentifiable structures within the cells. e) What careers would make use of the techniques learned in this activity Many careers would make use of the techniques demonstrated in this activity especially careers involved with science particularly the biology field. For example, careers involved in, medical forensics, medicine, pharmaceutical, dentistry and especially research. ...read more.

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