Which of the following statements form components of both the error theory of aging and the cross-linking theory of aging?
A) Free radicals cause mutations in cells.
B) Senescence is environmentally controlled at the cellular level.
C) Changes in DNA lead to organ malfunctions.
D) Genetic programming determines life expectancy.
C
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Both the error theory and the cross-linking theory assert some change in DNA that interferes with normal cell functioning. Such changes may be caused by free radicals or any of many other mutagens. Although the aging of cells may be environmentally influenced, it is not thought to be externally controlled. That genetic programming determines life expectancy is a basic tenet of the programmed theory of aging.
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