Khan Academy - Leading and Lagging Quiz

The leading strand adds base pairs toward

• the replication fork in the 3' to 5' direction.

• the replication fork in the 5' to 3' direction.

• the origin of replication in the 3' to 5' direction.

• the origin of replication in the 5' to 3' direction.

Which enzyme breaks the hydrogen bonds between the nitrogen bases?

• DNA polymerase

• DNA helicase

• DNA topoisomerase

• DNA primase

Which DNA enzyme seals small gaps to finish DNA replication?

• DNA helicase

• DNA polymerase

• DNA primase

• DNA ligase

The lagging strand adds bases in the

• 3' to 5' direction.

• 5' to 3' direction.

Which DNA enzyme adds new nucleotides to the DNA sequence?

• DNA ligase

• DNA polymerase

• DNA primase

• DNA topoisomerase