nucleus

Parts of the nucleus (5)

• Chromatin

• Lamina

• Nuclear pore

• Inner and outer membrane of nuclear envelope

• Ribosomes

Parts of the nuclear envelope (4)

• Outer membrane

• Inner membrane

• Lamina(пласт ника)

• Peri nuclear space

Functions of the nucleus (4)

1. Has genetic material

2. Regulates cell activity

3. Makes ribosomes in the nucleolus

4. Exports ribosomes to the cytoplasm for assembly

Function of the nuclear pore (3)

• Controls movement between cytoplasm and nucleus

• This needs nuclear localization signals

• GT-phase (ГТФ-аза)

Types of localisation signals

NLS - for import, recognised by importins

NES- for export , recognised by exportins

Structure of the nuclear pore (6)

• Terminal ring

• Nuclear basket

• Central framework

• Ring subunit

• Protein fibril

Types of chromatin (2)

Euchromatin

Heterochromatin

Features of Euchromatin

• Loose

• Active dna

Features of heterochromatin

• Dense

• Inactive

Types of heterochromatin (2)

Constitutive - always condensed

Facultative - can be inactive or active

Heterochromatins by location of nucleus (3)

• Marginal

• Nucleolar

• Karysomes