DNA Replication (Updated)

The video tutorial explains DNA replication, highlighting its importance in cell division. It covers where and when replication occurs, focusing on eukaryotic and prokaryotic cells. Key enzymes like helicase, DNA polymerase, primase, and ligase are introduced, detailing their roles. The process of DNA replication is explained, including the origin, strand separation, and directionality. The video concludes with the completion of replication, emphasizing proofreading to prevent errors.

Where does DNA replication occur in eukaryotic cells?

• In the ribosome

• In the mitochondria

• In the nucleus

• In the cytoplasm

Which enzyme is responsible for unzipping the DNA strands?

• Helicase

• Ligase

• Primase

• DNA polymerase

What is the role of primase in DNA replication?

• It glues DNA fragments together

• It proofreads the DNA

• It unwinds the DNA strands

• It synthesizes RNA primers

What prevents the DNA strands from re-annealing during replication?

• Topoisomerase

• Helicase

• SSB proteins

• Ligase

What is the direction of DNA synthesis by DNA polymerase?

• 1' to 6'

• 2' to 4'

• 5' to 3'

• 3' to 5'

What are Okazaki fragments?

• Short DNA sequences on the leading strand

• Short RNA sequences on the lagging strand

• Short RNA sequences on the leading strand

• Short DNA sequences on the lagging strand

Why is DNA replication considered semi-conservative?

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

• Each new DNA molecule contains only RNA strands

• Each new DNA molecule contains two new strands

• Each new DNA molecule contains two old strands