![Cells use the two-step process of transcription and translation to read each gene and produce the string of amino acids that makes up a protein.](https://webarchive.library.unt.edu/web/20130215192920im_/http://www.free.ed.gov/images/resources/dna-microarray.jpg)
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DNA Microarray is a "virtual lab" of a DNA microarray experiment. Compare samples of healthy tissue and...
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![Mitochondria are small compartments partitioned by membranes and found exclusively in complex cells.](https://webarchive.library.unt.edu/web/20130215192920im_/http://www.free.ed.gov/images/resources/tour-cell.jpg)
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A Tour of the Cell is an interactive exploration of the smallest unit of life, the cell. The human body is...
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![Leonardo da Vinci, Ginevra de' Benci, c. 1474/1478, oil on panel, National Gallery of Art, Ailsa Mellon Bruce Fund](https://webarchive.library.unt.edu/web/20130215192920im_/http://www.free.ed.gov/images/resources/nga-kids.jpg)
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NGAKids features child-focused stories, activities, and information on the Gallery's collections...
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![Highlight proportion and scale with this tool that allows you to compare image dimensions by using one image to paint another.](https://webarchive.library.unt.edu/web/20130215192920im_/http://www.free.ed.gov/images/resources/seeing-math-i.jpg)
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