DNA Replication

Which enzyme unwinds the DNA double helix during replication?

• DNA polymerase

• Helicase

• Ligase

• Primase

What is the role of single-strand binding proteins in DNA replication?

• To synthesize new DNA strands

• • To stabilize the unwound DNA strands

• • To join Okazaki fragments

• To unwind the DNA

Where does DNA replication begin on the DNA molecule?

• Replication forks

• Telomeres

• Origins of replication

• Centromeres

Which enzyme synthesizes the RNA primer needed to start DNA replication?

• DNA polymerase

• Helicase

• Ligase

• Primase

DNA polymerase adds nucleotides in which direction?

• 3’ to 5’

• 5’ to 3’

• 3’ to 3’

• • 5’ to 5’

What are Okazaki fragments?

• Long continuous DNA strands

• • Short segments of DNA synthesized on the lagging strand

• Enzymes that repair DNA

• Proteins that bind to DNA

Which enzyme is responsible for joining Okazaki fragments?

• DNA polymerase

• Helicase

• Ligase

•  Primase

What problem occurs at the 5’ end of the DNA strand during replication?

• • It becomes too long

• • It cannot be replicated completely

• It bonds with the 3’ end

•  It synthesizes too many nucleotides

1. Which structures protect the ends of chromosomes during replication?

• Centromeres

• Telomeres

• Nucleosomes

• Ribosomes

1. What is the role of telomerase?

• To shorten telomeres

• To lengthen telomeres

• To add RNA primers

• To unwind DNA