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from article Allosteric enzyme

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Model of an allosteric enzyme composed of two subunit monomers. Regulatory effects are obtained by shifting back and forth between the two states—relaxed (R state) and taut (T state). In the R state, the enzyme reacts with substrate and activators;…

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from article Dairy cattle production

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Modern machinery is used in the production of milk. (Credit: Yadamons/Getty Images)

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from article Dairy cattle production

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A typical dairy cattle farm in northeast Iowa. (Credit: Lynn Betts/Natural Resources Conservation Service, U.S. Department of Agriculture)

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from article Dairy cattle production

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Holstein dairy cattle in Washington County, Virginia. (Credit: Jeff Vanuga/Natural Resources Conservation Service, U.S. Department of Agriculture)

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from article Computer virus

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Some viruses are more destructive than others, causing devastation or theft of data. (Credit: iStockphoto.com/Zmeel Photography)

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from article Computer virus

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Daily virus threats experienced by large organizations.

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from article Computer virus

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Examples of vulnerabilities to computer viruses.

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from article Computer programming

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Program code. (Credit: Max Delson Martins Santos/Getty Images)

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from article Heart (invertebrate)

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Invertebrate hearts range from (left) the centralized hearts and open circulatory systems of grasshoppers to (right) the distributed hearts and closed circulatory systems of segmented worms. (Copyright © McGraw-Hill Education)

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