The enzyme that builds a short complementary piece of RNA at the start of each DNA segment to be replicated is

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The enzyme that builds a short complementary piece of RNA at the start of each DNA segment to be replicated is primase. Primase is a type of RNA polymerase that synthesizes RNA primers complementary to the DNA template strand, which provide the 3'-OH group required for DNA polymerase to initiate DNA synthesis. Helicase unwinds the double-stranded DNA molecule, ligase joins the Okazaki fragments on the lagging strand, DNA polymerase adds new nucleotides to the growing DNA strand, and ATP synthase synthesizes ATP from ADP and inorganic phosphate using the energy of the proton gradient.

The Enzyme That Builds a Short Complementary Piece of RNA