Explain some of the modern uses for radioisotopes in society
What will be an ideal response?
Radioisotopes can be used in a variety of medical applications for diagnosis (imaging studies, such as the use of radioactive iodine to detect thyroid cancer) or therapy (such as the use of radioactive seeds to treat prostate cancer). Although not discussed in the chapter, there are other uses. For example, phosphorus isotopes are used to sequence DNA and RNA for medical, forensic, and criminal applications. Many isotopes have been used for a variety of dating in geologic fields (e.g., carbon-14 has been used to date fossils).
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The spindle apparatus becomes visible during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Four of the five adaptations below allowed animals to live on land. Select the exception
a. eggs that can develop out of water b. waterproof skin c. lungs d. ectothermy e. internal fertilization
Concentrations of CFCs in the upper atmosphere are currently:
a. rising dramatically b. leveling off c. declining sharply d. undetectable e. rising slowly
Which hormone, made by the kidney, is necessary for red blood cell production by bone marrow?
a. erythropoietin b. hemoglobin c. insulin d. erythrocytes e. leucocytes