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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 Continental drift

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Map of the Earth as Pangea broke up as a result of continental drift. (Copyright © McGraw-Hill)

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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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from article Heart (invertebrate)

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Circulatory system in a marine snail (Aplysia). Arrows indicate the normal direction of blood flow. (Credit: E. Mayeri, J. Koester, I. Kupfermann, G. Liebeswar, and E. R. Kandel)

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from article Heart (invertebrate)

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Cardiac ganglion of a lobster (Homarus): (a) nerves on the inner dorsal surface of the heart; (b) cell body position of all nine intrinsic neurons. (Credit: D. K. Hartline)

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