ACT SSC Biology — Unit 2
DNA Replication — Flashcards & Quiz
ACT SSC Biology Year 12 Unit 2 covers DNA replication as the semi-conservative process that copies the genome before cell division. You need to name the enzymes, explain leading vs lagging strand synthesis, and describe how proofreading maintains fidelity. The Meselson-Stahl experiment provides the historical evidence.
Sample Flashcards
Q1: Outline the process of DNA replication.
Helicase unwinds and separates strands. DNA polymerase adds complementary nucleotides to each template strand (5' to 3'). Leading strand is continuous; lagging strand is made in Okazaki fragments joined by ligase.
Sample Quiz Questions
Q1: DNA polymerase synthesises new DNA strands in the 3' to 5' direction.
Answer: FALSE
DNA polymerase adds nucleotides in the 5' to 3' direction.
Last updated: March 2026 · 1 flashcards · 1 quiz questions