12.3 DNA Replication

Each new DNA molecule has_____________.

• two new strands

• one new strand, one original strand

• two original strands

• strands that are mixed up

DNA replication is_____________.

• conservative

• semi-conservative

• dispersive

• random

Which enzyme adds new nucleotides to build the new strand during the process of DNA replication

• Ligase

• DNA polymerase

• Helicase

• Telomerase

Which enzyme protects the ends of the DNA strand so that nothing is lost?

• Ligase

• DNA polymerase

• Helicase

• Telomerase

Which enzyme unzips (unwind) the DNA molecule?

• Ligase

• DNA polymerase

• Helicase

• Telomerase

Which enzyme joins the fragments of new DNA together?

• Ligase

• DNA polymerase

• helicase

• telomerase

DNA is replicated_______________.

• in the 3' to 5' direction

• in the 5' to 3' direction

• in any direction

• randomly

On the lagging strand, DNA is______________.

• not copied

• copied continuously

• copied backwards discontinuously

• discarded

On the leading strand, DNA is________________.

• not copied

• copied continuously

• copied backwards discontinuously

• discarded

What are Okazaki fragments?

• Pieces of new DNA forming on the lagging strand

• Pieces of new DNA forming on that leading strand

• Pieces of DNA that are discarded

• Pieces of RNA that serve as primers