Apedia

A-Level Biology OCR A

Dna Cell Proteins Nuclear Structure Function Nucleus Envelope

The nucleus houses the cell's DNA, controlling its activities and protein synthesis. It's enclosed by a nuclear envelope with pores and contains chromatin and a nucleolus.

The nucleus contains the cell's DNA, directing protein synthesis and controlling metabolic activity. Its structure includes a double-membraned nuclear envelope with pores, DNA organized as chromatin/chromosomes, and a nucleolus for ribosome production.

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

Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.

Next card: Endoplasmic reticulum responsible synthesis outline structure function ser

Previous card: Cell ultrastructure define term structure fine detail electron

Up to card list: A-Level Biology OCR A