All of the following can lead to cancer except
a. mutagens.
b. Bacteria.
c. mutations.
d. UV radiation.
e. carcinogens.
B
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In humans, structures that show developmental homology with other chordates are
A. the eyes and nostrils. B. gill ridges and a bony tail. C. fore and hindlimbs. D. the lungs and vertebrae.
A mutation that changes a codon that originally coded for an amino acid into a stop codon is a
A) frameshift mutation. B) missense mutation. C) silent mutation. D) nonsense mutation.
Entry of a virus into the lytic cycle after lysogeny has been established is called ________.
A. induction B. lysogenic conversion C. lysogenic reversion D. None of the choices are correct.
Which of the following statements regarding the surface of the skin is FALSE?
A) It has sebum as a coating. B) It has normal microbiota. C) It has goblet cells. D) It is salty. E) It is acidic.