DNA Structure and Replication Review

What is the double helix structure of DNA?

• A twisted ladder shape formed by two strands of nucleotides held together by hydrogen bonds.

• A straight line shape formed by one strand of nucleotides

• A square shape formed by four strands of nucleotides

• A circular structure formed by three strands of nucleotides

Explain the process of DNA replication.

• The process of DNA replication involves creating a single strand of DNA from a double helix.

• DNA replication occurs by combining two separate DNA molecules to form a double helix.

• The process of DNA replication involves unwinding the DNA double helix, separating the two strands, and using each strand as a template to synthesize a new complementary strand.

• During DNA replication, the two strands of DNA remain together and do not separate.

What is the role of helicase in DNA replication?

• Unwinds the double-stranded DNA

• Transcribes DNA into RNA

• Repairs damaged DNA

• Adds new nucleotides to the DNA strand

Describe the function of DNA polymerase in replication.

• It breaks down the DNA strand

• It repairs damaged DNA

• It adds nucleotides to the growing DNA strand.

• It regulates gene expression

What is meant by semi-conservative replication?

• Each new DNA molecule contains no original strands

• Each new DNA molecule contains one original strand and one newly synthesized strand.

• Each new DNA molecule contains three original strands

• Each new DNA molecule contains two original strands

How does DNA replication ensure the accuracy of genetic information?

• Proofreading and repair mechanisms

• Uncontrolled replication

• Lack of repair mechanisms

• Random mutation

Explain the role of ligase in the replication process.

• Ligase breaks down DNA strands during replication.

• Ligase joins Okazaki fragments on the lagging strand of DNA.

• Ligase is responsible for unwinding the DNA double helix.

• Ligase helps in the formation of RNA primers during replication.

What are the key differences between leading and lagging strands in DNA replication?

• The key difference is in the color of the strands and the size of the DNA molecules.

• The key difference is in the direction of synthesis and the method of DNA replication.

• The key difference is in the temperature required for synthesis and the type of cells involved.

• The key difference is in the speed of replication and the location within the cell.

Describe the function of primase in DNA replication.

• Adds phosphate groups to the DNA backbone

• Proofreads the newly synthesized DNA

• Synthesizes short RNA primers during DNA replication

• Unwinds the double helix