Nucleus

• Describe structures of the nucleus

  nuclear envelope (double membrane), nuclear pores, DNA, histones, chromosomes, chromatin, nucleolus.
• Describe nuclear envelope, nuclear pores.

  The nucleus is encased within a double membrane called a nuclear envelope. This has spaces in it called nuclear pores. Which allow substances such as RNA to move between the cytoplasm of the cell and the nucleus.
• Describe the structure of DNA, histones, chromosomes.

  DNA associates with proteins called histones. This complex coils tightly to form chromosomes which are found in the nucleus.
• What is Chromatin?

  A substance consisting of DNA and protein, is scattered throughout the nucleus.
• What is the nucleolus?

  A structure consisting of DNA, RNA and proteins. Some cells contain more than one nucleolus.
• What is the function of nucleus

  The nucleus controls the functions of the cell. It does this by controlling DNA transcription. The functions of the nucleus include controlling gene expression, protein synthesis and storing DNA (hereditary material).
• What is the function of the nucleolus?

  Protein synthesis and ribosome production occur here.
• What is the average size of the nucleus?

  usually between 10 and 20 micro meters.
• How many pores are there in a nucleus?

  3000 pores, between 10 and 20 micro meters.
• What is nucleoplasm?

  It is the granular, jelly-like material that makes up the bulk of the nucleus.