The cellular damage theories of aging include all of the following except the:
a. free-radical theory.
b. wear-and-tear theory.
c. cross-linking theory.
d. immunological theory.
Older people:
a. need at least six hours of sleep per night.
b. do not commonly suffer from insomnia.
c. can experience sleep apnea, which is related to increased risk for heart attack and stroke.
d. do not commonly suffer from sleep apnea.
Which statement about the free-radical theory of aging is false?
a. Free radicals are produced during metabolism.
b. Free radicals are unstable molecules.
c. Free radicals are produced by reduction reactions, damaging cell proteins, membranes, and DNA.
d. Damage by free radicals is associated with cancer and heart disease.
Which of the following statements is NOT consistent with cellular damage theories of aging?
a. Internal bodily processes are preset to age by genes.
b. Aging is caused by normal toxic by-products of metabolism.
c. Inefficient repair and defense systems cause aging.
d. Aging is caused by oxidative changes within cellular organelles.
Which statement best describes telomeres?
a. a fibrous protein that is the main support of connective tissues
b. the ends of chromosomes that shrink with each cell division
c. the unit of heredity in living organisms
d. a large macromolecule into which DNA is normally packaged in a cell
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