Which of the following results in a spontaneous mutation?
A. exposure to ultraviolet light and benzo (a)-pyrene
B. exposure to X-rays
C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke
D. exposure to ultraviolet light
E. free radicals produced by cellular metabolism
Answer: E
You might also like to view...
Variation among individuals in a species is usually caused by:
A. environmental variation. B. genetic variation. C. infectious variation. D. both environmental variation and genetic variation. E. environmental variation, genetic variation, and infectious variation.
Color vision in vertebrates is made possible by:
A. cone cells. B. rod cells. C. amicrine cells. D. ganglion cells.
More than half of all known species are ________
A) plants B) insects C) bacteria D) vertebrates
Systems in which feedback from changes in one direction elicit compensatory effects in the opposite direction.
What will be an ideal response?