Question

the harmful effects of radioactive isotopes
radioactive isotopes would be most harmful to a person when
multiple choice
unmonitored release into the environment makes changes in a cells dna.
they are used to trace molecular changes.
they are used to trace the path of materials throughout the body.
they are used to determine the age of biological specimens.
they are used to destroy abnormal cells.

Explanation:

• Option A: Unmonitored release causing DNA changes is harmful as DNA mutations can lead to diseases/cell malfunction.
• Option B: Tracing molecular changes is a controlled, beneficial use (e.g., in research).
• Option C: Tracing material paths in the body (like in medical tracers) is a safe, useful application.
• Option D: Determining specimen age (e.g., carbon dating) is a non - harmful analytical use.
• Option E: Destroying abnormal cells (like in cancer treatment) is a therapeutic, beneficial use.

Answer:

A. unmonitored release into the environment makes changes in a cell's DNA.