Answer:
it is option - B - An abandoned field
It is caused by mutations in the gene that helps an enzyme called phenylalanine hydroxylase, or PAH. <span />
Below are the choices:
(1) a nucleus
<span>(2) a chromosome </span>
<span>(3) a protein molecule </span>
<span>(4) an enzyme molecule
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In the nucleus. However since chromosomes are in the Nucleus they contain the <span>DNA a cell needs to survive. This is why it is in the Nucleus.
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To calculate the mass of a single atom, you would need to add up the protons and neutrons of a single atom.