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A-Level Biology OCR A

Dna Cell Proteins Nuclear Structure Function Nucleus Envelope

Front Outline the structure and function of the nucleus.
Back Nucleus - function
  • Contains the DNA of the cell - directs protein synthesis of all proteins required by the cell - controls metabolic activity of the cell (many of the proteins are enzymes necessary for metabolism to take place)

Nucleus - structure
  • DNA is surrounded by a double membrane - nuclear envelope - encloses and protects the DNA
  • Nuclear envelope contains nuclear pores - allows molecules to move in and out (mRNA move in/out carrying genetic info, not DNA as it is too big)
  • DNA is found in a complex - chromatin (DNA associated with histones - proteins) which coils and condenses to form chromosomes
  • Nucleolus - responsible for ribosome production, composed of proteins and RNA

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