We know that Beta clamp in bacteria has two subunits and takes the shape of a ring. Which of this will be characteristic of PCNA which is a beta clamp homologue for eukaryotes?

We know that Beta clamp in bacteria has two subunits and takes the shape of a ring. Which of this will be characteristic of PCNA which is a beta clamp homologue for eukaryotes? Correct Answer Three subunits forming ring

PCNA has three subunits but its structure is similar (ring) like two subunit beta clamp. Larger ring formation would be unreasonable as the basic structure of DNA is exactly the same for both prokaryotes and eukaryotes.
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