MDARD Michigan Core Pesticide Applicator Practice Exam

What is a mutagen?

1. A substance that kills cells

2. A substance that promotes cell growth

3. A substance that causes mutations

4. A substance that stabilizes DNA

The correct answer is: A substance that causes mutations

A mutagen is defined as a substance that causes mutations in the genetic material of an organism. Mutagens can induce changes in the DNA sequence, which may lead to alterations in gene function or expression. These changes can result in various effects, including the potential development of cancers or inherited genetic disorders. Understanding the role of mutagens is crucial in fields such as genetics, microbiology, and toxicology, as they can have significant impacts on biological systems and health. In contrast, substances that kill cells or promote cell growth do not align with the definition of a mutagen. Likewise, a substance that stabilizes DNA does not cause mutations and is therefore not categorized as a mutagen. The focus on mutagens emphasizes their potential to influence genetic integrity, a key aspect in assessing risks associated with chemical exposure.