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A LITTLE SOMETHING WORTH KNOWING

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ScienceOne small ahaBiology concept

These amino-acid chains include structural molecules such as the keratin in hair and nails.

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ScienceOne small aha
Your new ahaProteins

Proteins — example: Molecules like keratin that build hair and nails. Source: Protein ↗

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More from From Cells to Species

A few more worth knowing.

  1. 25These biological catalysts speed up reactions such as food digestion.RECALL
    Enzymes

    Enzymes act as biological catalysts, speeding up reactions such as the digestion of food.

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  2. 26Grass to rabbit to fox: this sequence traces energy passing between feeding organisms.RECALL
    Food Chain

    A food chain traces how energy passes from one organism to the next, as grass feeds rabbits that feed foxes.

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  3. 27Preserved remains or traces of ancient life.IDENTIFY
    Fossil

    Fossils preserve remains or traces of ancient life across long geological timescales, like dinosaur bones in rock layers.

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