DNA and RNA Quiz

What is the purpose of DNA replication?

• To change genetic code

• To create RNA

• To destroy damaged DNA

• To make two exact copies of DNA

When does DNA replication occur in the cell cycle?

• M phase

• Cytokinesis

• After meiosis

• Before mitosis

What is the role of DNA helicase in replication?

• To synthesize new nucleotides

• To repair mutations

• To copy mRNA

• To unzip and unwind the DNA strands

What structure forms where the DNA strands separate?

• Replication gap

• Mutation center

• Zipper zone

• Replication fork

Which enzyme adds new nucleotides during DNA replication?

• RNA polymerase

• Ligase

• Telomerase

• DNA polymerase

Which direction does DNA polymerase move along the original DNA strands?

• Always upward

• Circular motion

• Only 3’ to 5’

• In opposite directions

How does DNA polymerase ensure accuracy?

• It duplicates the DNA twice

• It skips over mutations

• It adds RNA bases

• It proofreads and checks for mistakes

What is a mutation?

• A protein synthesis event

• A chromosome split

• A DNA helicase malfunction

• A change in the nucleotide sequence

Which of the following can cause mutations?

• Water

• Protein synthesis

• Glucose

• UV radiation

What is the final result of DNA replication?

• Two new strands only

• One damaged and one fixed strand

• One RNA strand

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