Abstract
Some of the essential activities of a living cell are considered. These include the storage and transfer of information, the control of synthetic mechanisms, and the fabrication of specific molecules to carry out various biochemical processes. These activities depend on two types of polymer, found in all living organisms, the nucleic acids and the proteins. Knowledge about the molecular structure of these polymers, and of their behaviour, enables us to make a rudimentary physical picture of the mechanisms involved.

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