Radioactive isotopes
A. are frequently added to foods as nutritional supplements.
B. can be used in conjunction with PET scans to diagnose diseases.
C. do not occur naturally.
D. are never incorporated into organic compounds.
Answer:B
Radioactive isotopes
A. are frequently added to foods as nutritional supplements. B. can be used in conjunction with PET scans to diagnose diseases. C. do not occur naturally. D. are never incorporated into organic compounds.