<Li> 2 τ units (dnaX) which acts to dimerize two of the core enzymes (α, ε, and θ subunits). </Li> <Li> 1 γ unit (also dnaX) which acts as a clamp loader for the lagging strand Okazaki fragments, helping the two β subunits to form a unit and bind to DNA . The γ unit is made up of 5 γ subunits which include 3 γ subunits, 1 δ subunit (holA), and 1 δ' subunit (holB). The δ is involved in copying of the lagging strand . </Li> <Li> Χ (holC) and Ψ (holD) which form a 1: 1 complex and bind to γ or τ . X can also mediate the switch from RNA primer to DNA . </Li> <P> DNA polymerase III synthesizes base pairs at a rate of around 1000 nucleotides per second . DNA Pol III activity begins after strand separation at the origin of replication . Because DNA synthesis cannot start de novo, an RNA primer, complementary to part of the single - stranded DNA, is synthesized by primase (an RNA polymerase): </P>

Dna polymerase iii begins synthesizing dna from where