nitrogen
The central atom in a molecule is typically the one that is most electronegative.
Flavin adenine dinucleotide (FAD) serves primarily as a hydrogen atom carrier molecule in cells.
If memory serves correctly, it's if a molecule contains carbon.
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The metallic element that serves as the negative pole in a common flashlight battery is zinc.
mRNA (messenger RNA)
ATP (adenosine triphosphate) is made up of carbon, hydrogen, oxygen, nitrogen, and phosphorus atoms. These atoms are organized in specific arrangements to form the nucleotide molecule that serves as the primary energy carrier in cells.