Isotopes in Biochemistry Lecture 4 Quiz

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By ahmedsafaa



19 Questions

What is the main difference between stable and unstable isotopes?

How is the distribution of a radioisotope tracked in nuclear medicine?

What is the purpose of using technetium-99m in nuclear medicine?

How is radioactive iodine-131 used in diagnosing thyroid activity?

What is the half-life of tritium, a radioisotope of hydrogen?

What is the main function of stable isotopes in nuclear medicine?

What are the two main types of isotopes mentioned in the text?

Which element has isotopes with unique names deuterium and tritium?

What is the risk associated with excessive exposure to radioactive isotopes?

What is one example of a diagnostic application of radioactive iodine-131?

What is the main characteristic of radioactive isotopes used in nuclear medicine?

What is one medical application of radioactive isotopes?

What is an isotope?

Which of the following best describes the atomic number of an atom?

What is the mass number of an atom?

Which statement about isotopes is true?

What is the atomic number of carbon?

How many protons does a carbon-13 isotope have?

What distinguishes isotopes of the same element from each other?


  • Isotopes are variations of the same element with different numbers of neutrons in their nuclei.
  • All isotopes of a given element have the same atomic number and position in the periodic table.
  • Stable isotopes have a stable proton-neutron combination and do not decay, while unstable isotopes are radioactive and do decay.
  • Some elements can only exist as unstable isotopes.
  • Hydrogen has two stable isotopes: deuterium and tritium.
  • Stable isotopes do not emit radiation or pose health risks, while radioactive isotopes do.
  • The half-life of a radioisotope is the time it takes for half of a sample to decay.
  • Nuclear medicine uses radioactive isotopes in medical imaging and therapeutic applications.
  • Medical uses of radioactive isotopes include diagnosing and treating various conditions, such as thyroid disorders and cancer.
  • Technetium-99m is used in SPECT and PET imaging to examine organ function.
  • Iodine-131 is used in thyroid function testing.
  • Radioactive isotopes have short half-lives and typically decay before causing damage to patients.
  • Commonly used radioisotopes in medicine include technetium-99m, iodine-131, and 59 Fe.
  • Radioisotopes are used in cancer treatment, particularly for eye and skin cancer.
  • Radioisotopes are used for anemia diagnosis and gamma ray irradiation of tumors.
  • Technetium-99m, iodine-131, and xenon-133 are used for brain, thyroid, liver, bone marrow, lung, heart, and intestinal scanning.
  • Gold-198 is used for liver disease diagnosis.


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