Question

What is the structure and function of the nucleus?

Answer 1

dunno how detailed they want you to go with this but I can give you some pointers:

structure:
- shape is usually round/ovular
- double membranes w/ phospholipid bilayer
- may contain a dense region in the central part of the nucleus, called the nucleolus (makes ribosomal subunits for protein synthesis)
- membranes have pores that selectively allow transfer of material inside/outside nucleus

functions:
- protection and storage of DNA
- regulates gene expression
- processing and modification of pre-mRNA

Answer 2

https://prnt.sc/prqgs4

could this photo be a good picture of a nucleus?

Answer 3

possibly