DNA Replication Enzymes

Which is the second step?

• DNA Helicase unwinds original DNA strand

• RNA Primase lays down RNA primer for new nucleotide bases.

• DNA polymerase builds new strands by bring in new nucleotide bases.

• Ligase knits together fragments on lagging strand

Which is the third step?

• DNA Helicase unwinds original DNA strand

• RNA Primase lays down RNA primer for new nucleotide bases.

• DNA polymerase builds new strands by bring in new nucleotide bases.

• Ligase knits together fragments on lagging strand

Phases: Which is the fourth step?

• DNA Helicase unwinds original DNA strand

• RNA Primase lays down RNA primer for new nucleotide bases.

• DNA polymerase builds new strands by bring in new nucleotide bases.

• Ligase knits together fragments on lagging strand

Sometimes, DNA is called "semi-conservative." Why might this be?

• The old strand is "conserved" and used to make the new strands

• Uracil is "conserved" in that it is only used to make the new strands

• ATP is "conserved" via the usage of facilitated diffusion

• Ligase is "conserved" in that it is denatured by the process

Tags

NGSS.HS-LS1-1

Enzymes responsible for synthesis of new DNA

• Helicase

• Ligase

• Polymerase

• Topoisomerase

What enzyme is responsible for making the new DNA strand?

• DNA polymerase

• Helicase

• Ligase

• Primase

Which direction is DNA synthesized in DNA replication?

• 3' -> 5’

• 5' -> 3’

• C terminus to N terminus

• N terminus to C terminus

Enzymes responsible for sealing phosphodiester linkage

• Helicase

• Ligase

• Polymerase

• Topoisomerase

Enzymes responsible for relieve strand of double helix

• Helicase

• Ligase

• Polymerase

• Topoisomerase

Enzymes responsible for breaking H bonds between strands

• Helicase

• Ligase

• Polymerase

• Topoisomerase