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Transcript
Sizing Up Cells A DataTools sample investigation Key Parts of an Investigation • • • • • • • • • Question(s) Goals MA state frameworks Overview & approximate time Data and analysis tools Main steps for analysis techniques Background information Sample product(s) Student handouts for data collection & analysis (if provided); may be electronic Investigation Question(s) • How big is a cell? Are all cells alike? How do they compare in size, structure, and function? MA Science Framework • Life Science: Grades 6 to 8 • Structure and Function of Cells 3. Compare and contrast plant and animal cells, including major organelles (cell membrane, cell wall, nucleus, cytoplasm, chloroplasts, mitochondria, vacuoles). Typical Cell Diagrams Investigation Goals(s) • Students will develop an appreciation for the diversity and complexity of cells in living things • Students will recognize differences and similarities in size, structure, and function among cells • Students will understand basic cell structure and function Overview & Time • Students analyze digital images of cells, measuring lengths of a variety of cells • From 1 to 2 class periods up to a week Data & Analysis Tools • Images of cells with scale bars • ImageJ • Excel Steps for Data Analysis • • • • • • Set scale in ImageJ Measure cell lengths with ImageJ Chart average lengths in Excel Scale images to show relative sizes Copy & paste to compile a composite image Going Further: Annotate Cell images Background information • http://en.wikibooks.org/wiki/Biology_Cell_ biology_Introduction_Cell_size • http://simscience.org/membranes/advanced/ essay/cellsize1.html Cell or Ce ll Part anthrax b acteria e.coli bacteria mitochond ria general s ize for prokaryotes nucleus of human cheek cell length of a chlorop last human red blood cell most Eukaryo tic anim al cells human ch eek cell most Eukaryo tic plant cells small amoeba c ell human egg cell average amoeba cell onion skin plant cell large amoe ba cell giant squid ner ve cell spinal cord ner ve cell diam eter of an ostrich egg Length of a nerve ce ll of giraf fe's neck Size 1 µm 2 to 10 µm 3 µm 1 to 10 µm 5 µm 5 µm 7.5 µm 10 - 30 µm 60 µm 10 - 100 µm 90 µm 100 µm 300 µm 400 µm 800 µm 1000 µm 600,000 µm 120 mm 3 meters Cells vary in size, structure, and function Human blood cell Human cheek cell