21. Proteins which help to open the double helix for DNA synthesis are

A. DNA helicases
B. single stranded binding proteins
C. ligase
D. DNA topoisomerase

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22. First evident that DNA is genetic material comes from the experiment of Griffith is

A. transduction
B. transformation
C. replication
D. translation

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23. An RNA primer is synthesized by

A. DNA helicases
B. ligase
C. DNA topoisomerase
D. primase

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