The Intricacies of DNA Replication and Its Enzymatic Players

The video explains DNA replication, a process where DNA strands unwind and separate before cell division. Helicase enzymes create replication forks, and single-strand binding proteins prevent re-annealing. DNA primase creates RNA primers for DNA polymerase to synthesize new strands. The leading strand is synthesized continuously, while the lagging strand forms Okazaki fragments. RNA primers are removed, and DNA ligase joins fragments to complete replication.

What is the primary purpose of DNA replication in cells?

• To produce energy for the cell

• To pass genetic information to new cells

• To create new proteins

• To repair damaged DNA

Which enzyme is responsible for unwinding the DNA double helix?

• DNA polymerase

• Helicase

• Ligase

• Primase

What is the function of single-strand binding proteins (SSBs) during DNA replication?

• To remove RNA primers

• To join Okazaki fragments

• To prevent DNA strands from re-annealing

• To synthesize new DNA strands

Which strand is synthesized continuously during DNA replication?

• Leading strand

• Lagging strand

• Both strands

• Neither strand

What is the role of DNA primase in DNA replication?

• To remove RNA primers

• To join DNA fragments

• To create RNA primers

• To unwind the DNA helix

In which direction does DNA polymerase III synthesize new DNA?

• Neither direction

• 5' to 3'

• 3' to 5'

• Both directions

What are the short DNA fragments on the lagging strand called?

• Okazaki fragments

• Nucleotides

• Primers

• Replication forks

Which enzyme is responsible for joining Okazaki fragments together?

• Ligase

• DNA polymerase

• Primase

• Helicase

What happens to RNA primers during DNA replication?

• They are converted into DNA

• They are used to join DNA fragments

• They are removed and replaced with DNA

• They remain as part of the DNA strand

Which enzyme fills in the gaps left after RNA primers are removed?

• Helicase

• DNA polymerase III

• Ligase

• SSBs