# Chapter Three: Cell biology

### Nucleus - Function

| The nucleus regulates all cell activity. It does this by controlling the enzymes present. The chromatin is composed of DNA. DNA contains the information for the production of proteins. This information is encoded in the 4 DNA bases. Adenine, thymine, cytocine, and guanine. The specific sequence of these bases tells the cell what order to put the amino acids. There are three processes that enable the cell to manufacture protein: Replication allows the nucleus to make exact copies of its DNA Transcription allows the cell to make RNA working copies of its DNA In translation the Messenger RNA is used to line up amino acids into a protein molecule

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