DNA Replication and Enzymes

The video explains DNA's role as the cell's director, coding for traits and controlling cell functions. It introduces DNA replication, a process occurring in the nucleus during interphase, not during cell division. Key enzymes like helicase, polymerase, primase, and ligase are discussed, highlighting their roles in unzipping, building, initializing, and gluing DNA strands. The video details the replication process, emphasizing the anti-parallel nature of DNA strands and the challenges of replicating the lagging strand with Okazaki fragments. It concludes with the semi-conservative nature of replication and the proofreading ability of DNA polymerase.

What is the primary role of DNA in cells?

• To protect the cell from damage

• To transport nutrients

• To direct cell activities and code for traits

• To provide energy

During which phase does DNA replication typically occur?

• Prophase

• Cytokinesis

• Interphase

• Mitosis

Which enzyme is responsible for unzipping the DNA strands?

• DNA Polymerase

• Ligase

• Primase

• Helicase

What is the function of primase in DNA replication?

• To proofread DNA

• To create RNA primers

• To build new DNA strands

• To glue DNA fragments together

What is the role of DNA polymerase in the replication process?

• To unzip DNA strands

• To add DNA bases to new strands

• To bind DNA strands together

• To create RNA primers

What are the small fragments on the lagging strand called?

• Helicase fragments

• Polymerase fragments

• Okazaki fragments

• Ligase fragments

In which direction does DNA polymerase work?

• East to West

• North to South

• 5' to 3'

• 3' to 5'

What is the significance of DNA being semi-conservative?

• DNA is replicated without any errors

• DNA is replicated in a single direction

• Each new DNA molecule has one old and one new strand

• Each new DNA molecule has two new strands

What is the role of ligase in DNA replication?

• To unzip DNA strands

• To add DNA bases

• To create RNA primers

• To join Okazaki fragments

Why is DNA polymerase considered highly accurate?

• It unzips DNA strands

• It works in both directions

• It has proofreading ability

• It creates RNA primers