Isotopes in Biochemistry Lecture 4 Quiz
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Questions and Answers

What is the main difference between stable and unstable isotopes?

  • Stable isotopes do not decay and do not produce radiation, while unstable isotopes readily decay and give off subatomic particles and electromagnetic energy. (correct)
  • Stable isotopes can only exist in nature, while unstable isotopes are artificially produced in labs.
  • Stable isotopes are used in medicine, while unstable isotopes are not.
  • Stable isotopes have a longer half-life compared to unstable isotopes.

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

  • By capturing subatomic particles emitted by the radioisotope
  • By measuring the amount of radiation it gives off (correct)
  • By using radioactive iodine-131 for tracking purposes
  • By assessing the level of stability of the radioisotope

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

  • To diagnose and treat thyroid function
  • To scan various organs like the brain, heart, and lungs (correct)
  • To test for thyroid activity
  • To measure blood volume in the body

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

<p>It is administered to the patient to measure the amount of radioactivity in the thyroid gland. (C)</p> Signup and view all the answers

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

<p>12 years (D)</p> Signup and view all the answers

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

<p>To track the distribution of radioisotopes in the body (A)</p> Signup and view all the answers

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

<p>Stable and unstable (A)</p> Signup and view all the answers

Which element has isotopes with unique names deuterium and tritium?

<p>Hydrogen (C)</p> Signup and view all the answers

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

<p>Damage to human cells and potential cancer development (D)</p> Signup and view all the answers

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

<p>Diagnosing hyperthyroidism and hypothyroidism (A)</p> Signup and view all the answers

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

<p>They have short half-lives and typically decay before causing damage to the patient's body. (C)</p> Signup and view all the answers

What is one medical application of radioactive isotopes?

<p>Imaging specific organs like brain, heart, and lungs (C)</p> Signup and view all the answers

What is an isotope?

<p>An atom with the same atomic number but different mass number (D)</p> Signup and view all the answers

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

<p>Number of protons in the nucleus (B)</p> Signup and view all the answers

What is the mass number of an atom?

<p>Total nucleon number (D)</p> Signup and view all the answers

Which statement about isotopes is true?

<p>Isotopes have different atomic masses (A)</p> Signup and view all the answers

What is the atomic number of carbon?

<p>6 (A)</p> Signup and view all the answers

How many protons does a carbon-13 isotope have?

<p>6 (D)</p> Signup and view all the answers

What distinguishes isotopes of the same element from each other?

<p>Mass number (D)</p> Signup and view all the answers

Study Notes

  • 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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