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_Introduc tion_Cell_size http://simscience.org/ membranes/advanced/essay/ cellsize1.html
Cell or Cell Part anthrax bacteria e.coli bacteria mitochondria general size for prokaryotes nucleus of human cheek cell length of a chloroplast human red blood cell most Eukaryotic animal cells human cheek cell most Eukaryotic plant cells
small amoeba cell human egg cell average amoeba cell onion skin plant cell large amoeba cell giant squid nerve cell spinal cord nerve cell diameter of an ostrich egg Length of a nerve cell of giraffe's neck Size 1 m
2 to 10 m 3 m 1 to 10 m 5 m 5 m 7.5 m 10 - 30 m 60 m 10 - 100 m 90 m 100 m 300 m
400 m 800 m 1000 m 600,000 m 120 mm 3 meters Cells vary in size, structure, and function Human blood cell
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