A unique feature of the nucleus is that it disassembles and re-forms each time most cells divide. At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm.
Answer:
1- α-helices and β-arrays
The building blocks of nucleic acids is nucleotides
Meiosis is the cell division in which there is a formation of chiasmata......which lead to variation......
