Answer:
Nucleotide, Gene, DNA, Chromosome, Cell.
Explanation:
<span>A. Restriction enzymes would be used to cut the DNA into smaller pieces. The first step in DNA manipulation for genetic engineering is </span>to choose the piece of DNA from a source. Restriction enzymes are used in cutting these DNA pieces.
It has 4 valence electrons :)
Elements are made of a single type of atom.