Summary
The control centre of a eukaryotic cell, enclosed by a double membrane and containing the chromosomes.
In depth
The nucleus is enclosed by a double nuclear envelope perforated with nuclear pores. Inside are chromatin (DNA wrapped around histones) and the nucleolus, where ribosomal RNA is made and ribosome subunits are assembled. The nucleus is where DNA is replicated and transcribed into RNA.
mRNA must be processed (capped, spliced, polyadenylated) before it leaves through the pores, which separates transcription from translation in space and time. Nuclear lamins underlie the envelope and give it shape.
Frequently asked questions
What is Nucleus?
The control centre of a eukaryotic cell, enclosed by a double membrane and containing the chromosomes.
Which area of biology covers Nucleus, and how advanced is it?
Nucleus is one of the 52 topics in Cell Biology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Eukaryotic Cell, Nuclear Pore Complex, Prokaryotic Cell.
Can you give an example of Nucleus?
Mature mammalian red blood cells eject their nucleus, which gives more room for haemoglobin but means they cannot repair themselves or divide.
What should I learn before Nucleus?
Nucleus is a Beginner topic, so no earlier topic is required. Other Beginner topics in Cell Biology that pair well with it include Cell Theory, Prokaryotic Cell, Eukaryotic Cell.
What topics are related to Nucleus?
The closest topics to Nucleus are Eukaryotic Cell, Nuclear Pore Complex, Prokaryotic Cell, Ribosome. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Nucleus?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Nucleus. To practise the whole of Cell Biology, use the Cell Biology quiz.
How is Nucleus different from Eukaryotic Cell?
Nucleus: The control centre of a eukaryotic cell, enclosed by a double membrane and containing the chromosomes. Eukaryotic Cell: A complex cell with a true nucleus and membrane-bound organelles, found in animals, plants, fungi and protists. Read both side by side and note what each one explains.
How should I study Nucleus step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Eukaryotic Cell and explain the difference aloud. Finally, take the Cell Biology quiz and come back to this page for any question you miss.