Exploring DNA Replication Mechanisms

The video tutorial covers DNA replication, explaining its purpose in cell replication and the semi-conservative model. It details the replication process, including the directionality, bi-directional replication, and initiation. The video also discusses elongation, Okazaki fragments, proofreading, and primer removal. Clinical applications, such as HIV treatment, are highlighted, along with the termination of replication. The role of telomeres and telomerase in preventing gene loss is also explained.

What is the primary purpose of DNA replication?

• To repair damaged DNA

• To create RNA

• To allow cells to replicate and make more cells

• To produce proteins

Tags

NGSS.HS-LS3-2

During which phase of the cell cycle does DNA replication primarily occur?

• Mitosis

• G1 phase

• S phase

• G2 phase

What does the semi-conservative model of DNA replication mean?

• DNA replication occurs in a random manner

• DNA replication only occurs in one direction

• Each new DNA molecule consists of one old strand and one new strand

• Each new DNA molecule consists of two new strands

In which direction does DNA replication occur?

• Random direction

• 5' to 3'

• Both 3' to 5' and 5' to 3'

• 3' to 5'

What is the role of the enzyme helicase in DNA replication?

• To unwind the DNA double helix

• To add RNA primers

• To synthesize new DNA strands

• To stitch together Okazaki fragments

What is the direction in which DNA polymerase synthesizes a new DNA strand?

• 4' to 2'

• 2' to 4'

• 5' to 3'

• 3' to 5'

What are Okazaki fragments?

• Continuous DNA strands on the leading strand

• Short DNA fragments on the lagging strand

• RNA primers on the leading strand

• Proteins involved in DNA replication

Which enzyme is responsible for removing RNA primers during DNA replication?

• DNA polymerase type 3

• Ligase

• Primase

• DNA polymerase type 1

What is the role of ligase in DNA replication?

• Unwinding the DNA helix

• Sealing gaps between Okazaki fragments

• Removing RNA primers

• Synthesizing new DNA strands

What is the function of telomerase?

• Shortening telomeres

• Elongating telomeres

• Synthesizing RNA primers

• Proofreading DNA