IB Biology DNA Replication and Protein Synthesis

Enzyme that unwinds the DNA

• ligase
• DNA Polymerase
• primase
• helicase

Seals the Okazaki fragments together

• DNA Polymerase
• ligase
• helicase
• primase

Adds nucleotides to the newly synthesized strand of DNA

• DNA polymerase I
• DNA polymerase III
• Primase
• Ligase

synthesizes a short fragment of RNA that allows DNA polymerase III to bind

• ligase
• DNA polymerase I
• primase
• helicase

removes the RNA primer and adds DNA nucleotides to fill in the gap

• DNA polymerase III
• ligase
• primase
• DNA polymerase I

direction new nucleotides are synthesized on the new strand

• 5^' to 3' (new nucleotides added to the 3' end)
• 3' to 5' (new nucleotides added to the 5' end)

repetitive sequences of DNA on the ends of chromosomes (TTAGGG)

• telomeres
• telomerase
• Okazaki fragments
• primer

Experiment that radioactively labeled the proteins and DNA of bacteriophages to determine if DNA or protein was the transforming agent

• Avery
• Watson & Crick
• Messelson & Stahl
• Hershey & Chase

Enzyme that relieves tension on helix as DNA unwinds

• helicase
• DNA gyrase
• DNA polymerase III
• ligase

Proteins that stabilize single strands on unwound sections of DNA

• ligase
• helicase
• SSBs
• dNTPs