複選題3. Which following description(s) is/are CORRECT about Okazaki fragments? (A) Short RNA primers needed for initiation of polymerization (B) Short stretches of DNA formed on the lagging strand (C) The smallest subunit of DNA polymerase III (D) Fragment of DNA polymerase I that lack 5' to 3' exonuclease activity (E) The non-specific side products of DNA replication