DNA Replication Quiz for 9th Grade Biology

What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which enzyme is responsible for unwinding the DNA helix during replication?

• DNA polymerase

• Helicase

• Ligase

• Primase

What is the role of DNA polymerase in DNA replication?

• Unwinding the DNA helix

• Joining Okazaki fragments

• Adding nucleotides to the growing DNA strand

• Creating RNA primers

What is the function of RNA primase in DNA replication?

• Proofreading the new DNA strand

• Unwinding the DNA helix

• Synthesizing RNA primers

• Joining Okazaki fragments

Which strand is synthesized continuously during DNA replication?

• Leading strand

• Lagging strand

• Both are synthesized continuously

• Neither is synthesized continuously

Which strand is synthesized in short segments during DNA replication?

• Leading strand

• Lagging strand

• Both are synthesized in short segments

• Neither is synthesized in short segments

What are the short segments of DNA synthesized on the lagging strand called?

• RNA primers

• DNA polymerases

• Okazaki fragments

• Helicase fragments

Which enzyme is responsible for joining Okazaki fragments?

• Helicase

• DNA polymerase

• Ligase

• Primase

What is the first step of DNA replication?

• Synthesis of RNA primers

• Unwinding of the DNA helix

• Elongation of the DNA strand

• Proofreading and repair

Which component is not a part of a nucleotide?

• Phosphate group

• Sugar

• Amino acid

• Nitrogenous base