The appearance, ultrastructure and function of the nucleus.

Nucleus:

• Nuclear envelope
• Double membrane
• Controls the movement of substances in and out of the nucleus
• Can have ribosomes on the surface
• Can be continuous with (joined/next to) endoplasmic reticulum
• Contains chromatin
• DNA for the cell
• Form chromosomes take when the cell is not dividing
• Nucleolus
• Makes rRNA (coding for ribosomes)
• Assembles ribosomes
• Makes mRNA (coding for proteins) and controls protein synthesis
• Nucleoplasam
• Viscous liquid
• Molecules and organelles of the nucleus suspended in it
• Holds the structure of the nucleus

thelogos.co.uk

Not to scale