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What is the Nucleus | Nucleus Structure and Function

Thanks for stopping by this is 2 minute classroom

and today we're talking about the structure and function of the nucleus

The nucleus sits in the center of eukaryotic cells and houses the DNA

It protects your genetic information

and directs the synthesis of ribosomes and the expression of your genes

It's also the location of transcription and DNA replication

You can think of it as the brain of the cell

the nucleus has a very distinct structure

It's surrounded by a double membrane called the nuclear envelope

which contains special nuclear pores through which ribosomes and RNA exit

This nuclear envelope protects the DNA from nuclease enzymes in the cell whose job it is to destroy nucleotides

and you don't want your DNA destroyed

the DNA never leaves the nucleus for the same reason

Within the nucleus there's a dark region called the nucleolus

This area is densely packed with RNA and proteins

and is a location of ribosome assembly, among other functions

ribosomes have a big impact on cellular processes

and I'll create a separate video about ribosomes and link it here when it's ready

The nucleolus sits in the nucleoplasm

Which encompasses the remaining contents of the nucleus

This is where the DNA is located

when the cell is getting ready to divide the DNA forms chromosomes

These are structures you may be familiar with

humans have 46 chromosomes in each cell

However, most of the time the DNA is not in this chromosome structure

But is called chromatin with the DNA being less compact and wrapped around special histone proteins

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