This video tutorial by Mr. Vev explains the process of DNA replication, highlighting its importance for cell division and function. It covers the steps involved, including the roles of enzymes like helicase, DNA polymerase, and DNA ligase. The semiconservative model of replication is discussed, emphasizing the accuracy and proofreading capabilities of DNA polymerase to minimize errors and mutations.

Why is DNA replication crucial before cell division?

• To destroy old DNA

• To change the genetic code

• To ensure each new cell has a complete set of DNA

• To create more proteins

What is the role of helicase in DNA replication?

• It joins the DNA strands together

• It acts as a proofreader

• It unzips the DNA double helix

• It adds nucleotides to the DNA strand

Which enzyme is responsible for adding nucleotides during DNA replication?

• Helicase

• DNA ligase

• DNA polymerase

• RNA polymerase

What does DNA polymerase do besides adding nucleotides?

• It unzips the DNA strands

• It joins the DNA strands

• It synthesizes RNA

• It proofreads and corrects errors

What is the function of DNA ligase in DNA replication?

• It unzips the DNA strands

• It adds nucleotides to the DNA strand

• It proofreads the DNA

• It joins the new and original DNA strands

What is meant by the semiconservative model of DNA replication?

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

• DNA replication occurs only once

• The original DNA molecule remains unchanged

• Each new DNA molecule has two new strands

How does DNA polymerase ensure the accuracy of DNA replication?

• By unzipping the DNA strands

• By joining the DNA strands

• By proofreading and correcting errors

• By synthesizing RNA

What happens if DNA polymerase makes an error during replication?

• The error leads to a mutation

• The error is corrected by DNA ligase

• The error is ignored

• The error is corrected by DNA polymerase

Which of the following is NOT a function of DNA polymerase?

• Unzipping the DNA double helix

• Adding nucleotides to the DNA strand

• Proofreading the DNA

• Correcting errors in the DNA

What is the result of DNA replication?

• One new DNA molecule with two new strands

• One new DNA molecule with two original strands

• Two identical DNA molecules, each with two new strands

• Two identical DNA molecules, each with one new and one original strand