A primer of ____ is needed at the origin of nucleotide addition.Group of answer choicesRNAPolymerase IIIDNAHelicasePolymerase I

To answer the question, we need to identify which enzyme is essential at the origin of nucleotide addition in the context of nucleic acid synthesis.

Understanding the Options:

1. RNA Polymerase III: This enzyme is mainly involved in synthesizing RNA molecules from a DNA template but does not initiate DNA synthesis.
2. DNA: This is the molecule itself, not an enzyme, so it cannot be the answer.
3. Helicase: This enzyme unwinds the DNA double helix but does not add nucleotides directly.
4. Polymerase I: This enzyme plays a role in DNA replication and repair but is not primarily responsible for initiating nucleotide addition.

Conclusion:

The correct answer here is RNA Polymerase III, which is required for the synthesis of RNA during transcription. In the context of DNA replication, however, the enzyme that initiates nucleotide addition is typically not listed among these choices. If the context is transcription, then RNA Polymerase III is indeed needed to start RNA synthesis.

Final Answer

The correct option is RNA Polymerase III.