The phosphate group in a nucleotide contains which elements?

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Multiple Choice

The phosphate group in a nucleotide contains which elements?

Explanation:
The key idea is recognizing what the phosphate group in a nucleotide is made of. The phosphate moiety is a PO4 unit, with phosphorus bonded to oxygen atoms. So, the elements present are phosphorus and oxygen. This group carries a negative charge and forms the phosphodiester linkages that connect nucleotides in DNA and RNA. The other elements listed don’t form the phosphate group itself—carbon and hydrogen are common in the sugar and bases, nitrogen and sulfur show up in bases and other biomolecules, and magnesium or calcium are ions that can associate with phosphates but aren’t part of the phosphate group itself.

The key idea is recognizing what the phosphate group in a nucleotide is made of. The phosphate moiety is a PO4 unit, with phosphorus bonded to oxygen atoms. So, the elements present are phosphorus and oxygen. This group carries a negative charge and forms the phosphodiester linkages that connect nucleotides in DNA and RNA. The other elements listed don’t form the phosphate group itself—carbon and hydrogen are common in the sugar and bases, nitrogen and sulfur show up in bases and other biomolecules, and magnesium or calcium are ions that can associate with phosphates but aren’t part of the phosphate group itself.

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