In radiation therapy, cancer cells are killed by ____

a. carbon
b. radium
c. iodine
d. thallium
e. nitrogen


B

Biology & Microbiology

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Ultraviolet light damages DNA by causing

A) purine rings. B) strand breaks. C) thymine dimers. D) radioactivity.

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The ion that increases its intracellular concentration in order to trigger the release of neurotransmitters is

A. HCO3- B. Ca2+ C. Cl- D. Mg2+ E. K+

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Which disorder is characterized by the individual having a normal number of sex chromosomes?

A) Turner syndrome B) Klinefelter syndrome C) Trisomy X D) XYY syndrome E) Down syndrome

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