Question

multiple choice question

transposons that carry large blocks of genetic material that transmit drug resistance are called ______.

retrotransposons
integrons
insertion elements

Explanation:

Analyze the question and definitions

The question asks for the term describing transposons that carry large blocks of genetic material transmitting drug resistance.

• Insertion elements (IS elements): The simplest transposable elements, containing only the genes necessary for transposition (e.g., transposase) flanked by inverted repeats. They do not carry additional genes like drug resistance.
• Retrotransposons: Transposable elements that move via an RNA intermediate (primarily in eukaryotes) and are not typically associated with bacterial drug resistance blocks.
• Integrons: Genetic units that can capture, express, and mobilize gene cassettes, often carrying multiple antibiotic resistance genes (large blocks of genetic material) and frequently associated with transposons.

Determine the correct choice

Integrons are the specific elements known for carrying large blocks of genetic material (gene cassettes) that transmit drug resistance.

Answer:

• retrotransposons
• integrons (Correct answer)
• insertion elements