Nucleus Flashcards
What does the contents of the nucleus contain?
Aqueous solution
DNA
RNA
Proteins
What is the nuclear lamina?
Proteins which provide support and organisation within the nucleus
What are lamins?
The proteins which make up the lamina
What shape does the lamina take?
2D lattice of fibres
What is the structure of a lamin?
Globular head
Rod like central helix domain called a dimer
Pairs of dimers twist to form long filaments
How is the lamina in contact with the inner membrane?
Anchors at the end of lamins attach the lamina to the inner membrane
What is the nucleolus and what does it contain?
An area within the nucleus that is not encapsulated by a membrane
Contains ribosomal RNA
What occurs in the nucleolus?
Ribosomal subunit synthesis
What is the nuclear envelope made of?
An inner and outer membrane
What other component of the cell is the inner membrane attached to?
The nuclear lamina
What other component of the cell is the outer membrane attached to?
The endoplasmic reticulum
What molecules are transported across the nuclear envelope?
Nuclear proteins - in
RNA - out
Ribosomal subunits - out
What is the structure of the nuclear pore?
Cytoplasmic protrusions
Central ring
Nuclear basket structure
What does the nuclear basket structure do?
Regulates molecules being transported into and out of the nucleus
How do small molecules pass through nuclear pores?
Passive diffusion
