GC#2 Mutagens II Chemicals

What is a mutagen?

• A substance that stabilizes DNA

• A substance that causes mutations

• A type of DNA polymerase

• A protein that repairs DNA

How can chemicals act as mutagens?

• By repairing mutations in the DNA

• By causing mutations in the DNA

• By stabilizing the DNA structure

• By acting as a template for DNA replication

Which of the following is NOT a way chemicals can enter our bodies to cause mutations?

• Telepathic transmission

• Ingestion

• Absorption through the skin

• Breathing them in

What are base analogues?

• Proteins that enhance mutation

• Chemicals that mimic the structure of DNA bases

• Viruses that cause genetic mutations

• Enzymes that repair DNA

Why do most chemical mutagens act as mutagens?

• Because they are radioactive

• Because they are essential nutrients for DNA replication

• Because they have a similar structure to nucleotides

• Because they destroy nucleotides

Which of the following chemicals is known to be a mutagen?

• Glucose

• Benzene

• Oxygen

• Water

What is the impact of chemical mutagens on DNA?

• They repair damaged DNA

• They cause mutations in the DNA

• They have no impact on DNA

• They enhance DNA replication

How do base analogues cause mutations?

• By mimicking the structure of DNA bases and causing mispairings

• By repairing DNA

• By preventing DNA replication

• By acting as enzymes

What is the role of the ribose sugar in the structure of a nitrogenous base?

• It serves as a base analogue

• It acts as a mutagen

• It links the base to the phosphate strand

• It prevents mutations

Which of the following is NOT a method through which mutagens can cause mutations?

• By interfering with the process of poly peptide synthesis

• By directly altering the genetic code without entering the cell

• By mimicking the structure of DNA bases

• During cell replication when the nuclear membrane is broken down