Nucleus, Usually the largest organelle in eukaryotes, Houses the DNA (site of DNA replication and transcription), Nucleolus, An area of the nucleus where ribosomes are assembled, Nuclear envelope, This is a double membrane that surrounds the nucleus, The outer membrane is continuous with the endoplasmic reticulum (ER), Contains thousands of nuclear pores, Controls what enters and exits the nucleus - proteins must have a special recognition sequence to be allowed in, Nuclear lamina, Protein filaments that help maintain the shape of the nucleus, Underneath the double membrane, Chromatin, DNA and proteins form this inside the nucleus, This is arranged as long molecules called chromosomes, Contains instructions (genes) for making over 20,000 different proteins, Humans have 46 chromosomes composed of this

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