Ribsomes, Nucelus, Nucleolus, Chromosomes | 4.3

Nucleus

Contains most of the DNA in an eukaryotic cell.

Ribosomes

Use the information from the DNA to make proteins.

Nuclear envelope

Encloses the nucleus, separating it from the cytoplasm.

Nuclear membrane

Double membrane consisting of a lipid bi-layer.

Pores

Regulate the entry and exit of molecules from the nucleus.

Nuclear lamina

Composed of protein, maintains the shape of the nucleus.

Chromosomes

DNA organized into discrete units.

Chromatin

DNA and proteins of chromosomes together.

Nucleolus

Located within the nucleus, site of rRNA synthesis.

Ribosomes

Complexes of ribosomal RNA and protein.

Free ribosomes

Carry out protein synthesis in the cytosol.

Bound ribosomes

Located on the outside of ER or nuclear envelope, carry out protein synthesis.