Which of the following enzymes is responsible for removing RNA primers and replacing them with DNA?

• A. Primase.
• B. DNA Helicase.
• C. DNA Polymerase III.
• D. DNA Polymerase I.

Answer: (D)

Verified step by step guidance

1. Understand the role of RNA primers in DNA replication: RNA primers are short sequences of RNA nucleotides that provide a starting point for DNA synthesis.
2. Identify the function of each enzyme listed: Primase synthesizes RNA primers; DNA Helicase unwinds the DNA double helix; DNA Polymerase III extends the DNA strand by adding nucleotides.
3. Focus on the task of removing RNA primers: This task involves both removing the RNA nucleotides and replacing them with DNA nucleotides.
4. Recognize the specific enzyme responsible for this task: DNA Polymerase I has the unique ability to remove RNA primers and fill in the gaps with DNA nucleotides.
5. Conclude that DNA Polymerase I is the enzyme that performs the dual function of removing RNA primers and replacing them with DNA during DNA replication.