Which of the following statements about radioactive isotopes is true?
A) The nuclei of radioactive isotopes are unusually stable, but the atoms tend to lose electrons.
B) When given a choice between radioactive and nonradioactive isotopes of the same atom, living cells are more likely to incorporate the radioactive isotopes into their structures.
C) The energy emitted by radioactive isotopes can cause molecular damage in cells.
D) Radioactive elements are natural and therefore not harmful.
Answer: C
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A) multidrug resistance transport protein. B) import transporter proteins. C) cystic fibrosis transmembrane conductance regulator. D) human catalytic convertase. E) none of the above; no such transporter has been identified in eukaryotes.
Fibrous structures with three "arms" some archaea use for attachment to surfaces are (fimbriae/hami/pili)
What will be an ideal response?
Pouches in the gut wall developed into ____ in
fishes that are ancestral to land vertebrates. a. heart chambers b. the notochord c. lobes of the liver d. lungs e. vocal cords
Oxygen was necessary in the atmosphere before
A. photosynthesis could occur. B. life could begin. C. metabolism could occur. D. aerobic respiration could occur.