DNA Replication Quiz

What is the primary structure of DNA?

• Single-stranded molecule

• Double-stranded molecule

• Triple-stranded molecule

• Quadruple-stranded molecule

What is the role of DNA helicase in DNA replication?

• It forms phosphodiester bonds

• It breaks hydrogen bonds between bases

• It joins shorter DNA strands

• It adds nucleotides to the growing strand

What distinguishes an activated nucleotide from a normal nucleotide?

• It has one phosphate group

• It has two phosphate groups

• It has no phosphate groups

• It has three phosphate groups

What type of reaction is involved in forming phosphodiester bonds?

• Hydrolysis reaction

• Oxidation reaction

• Condensation reaction

• Reduction reaction

What is semi-conservative replication?

• Each new DNA molecule has two new strands

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

• Each new DNA molecule has two old strands

• Each new DNA molecule has no strands

What is a mutation in the context of DNA replication?

• An addition of extra DNA strands

• A deletion of the DNA sequence

• A perfect copy of the DNA sequence

• A change in the DNA sequence

What is the role of DNA ligase in DNA replication?

• It breaks hydrogen bonds

• It joins shorter DNA strands

• It forms phosphodiester bonds

• It adds nucleotides to the growing strand

In which direction does DNA polymerase synthesize the new DNA strand?

• 3' to 5'

• 4' to 2'

• 5' to 3'

• 2' to 4'

What happens to the extra phosphate groups in activated nucleotides during DNA replication?

• They are incorporated into the DNA strand

• They are converted into water

• They remain attached to the nucleotides

• They provide energy for the reaction

Why is it important for DNA to be copied accurately?

• To increase the number of DNA strands

• To ensure genetic diversity

• To prevent mutations

• To decrease the number of DNA strands