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Does that mean your cells express all of those genes, all the time? Even an organism as simple as a bacterium must carefully regulate gene expression, ensuring that the right genes are expressed at the right time.

Learn more about the mechanisms cells use to turn genes "on" and "off."What is biotechnology?

In fact, so do dogs, elephants, and even human beings! Discover the diversity of life on Earth and the forces that shape it!

Learn how multicellular organisms end up with many different cell types, organized into the tissues and organs of the body. They number in the millions of trillions of trillions. In this section, you can learn about evolution, natural selection, and the tree of life, as well as basic population genetics.

You, like other living systems, are an amazing energy transformer.

As you move your eyes to read these words, your body is busily converting chemical energy from your lunch into kinetic energy and thermal energy (heat). Some of them are eukaryotic (human), but many more of them are prokaryotic, thanks to the friendly bacteria of your gut, skin, and other body systems.

How do the cells in your body define their boundaries (and control what comes in or goes out)?Learn more about modern biotechnology and how it is used in research and biomedical applications.Did you know that a frog starts out as a single cell?Did you know that your body is approximately 18% carbon?Learn more about carbon and why it makes a great building block for biological molecules.We'll look at the bonding properties of carbon, the structures of hydrocarbons, different types of isomerism, and some functional groups important in biology.

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