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Proteins do more different jobs in a living cell than almost any other class of molecule: they build muscle fiber, transport oxygen in blood, defend

Every instruction your body needs to build and run itself is stored in a molecule made from just four repeating chemical building blocks. **DNA (deox

Many of the chemical reactions that keep you alive, breaking down the food you eat, copying your DNA, sending nerve signals, would take impractically

Rubber, plastic bags, nylon rope, and your own DNA all share the same basic architectural strategy: taking a small, simple building block and linking

A single molecular formula can describe more than one real, distinct compound, sometimes with dramatically different properties. C₄H₁₀ can be either

Hemoglobin, chlorophyll, and the vivid blue color of dissolved copper sulfate all share a common structural theme: a central metal ion surrounded by